Quick Answer
Flatwound guitar strings are wound with a flat ribbon of wire instead of a round one, then polished smooth. The result is a string with almost no surface texture. There is far less finger squeak when you slide, and the feel under the fingertips is noticeably different from a roundwound set.
We make a Flat Wound Electric set in two gauges (11-50 and 12-52). If you want a smoother feel that’s closer to a roundwound set, our Silencer Semi-Flat sets are a separate option, available for electric and acoustic guitar.
| Type | Surface | S.I.T. option |
|---|---|---|
| Roundwound | Round wire wrap, textured surface | Power Wound, Power Steel, and others |
| Semi-flat | Round wire wrap, surface smoothed | Silencer Semi-Flat (electric and acoustic) |
| Flatwound | Flat ribbon wrap, polished smooth | Flat Wound Electric |
What Makes a String “Flatwound”?
Every wound guitar string has a core wire with another wire wrapped around it. In many modern electric guitar sets, the D, A, and low E strings are wound while the G, B, and high E are plain, although some sets use a wound G. Our Flat Wound Electric sets use a wound 3rd string, so the G, D, A, and low E strings are all wound.
In a roundwound string, the wrap wire has a round cross-section. That leaves small ridges between each turn of the wrap, which is the texture you feel and hear when your fingers slide along the string.
In a flatwound string, the wrap is a flat ribbon. The outer surface is then polished, so there is very little ridging. Our Flat Wound Electric strings use a stainless-steel ribbon wound over a steel core and polished smooth. We describe the result as a flat feel without finger noise.
In our Flat Wound Electric sets, the 1st and 2nd strings are plain steel. The 3rd through 6th strings are flatwound, including a wound G string.
Flatwound vs. Semi-Flat vs. Roundwound
These are three different constructions, and they sit on a spectrum of surface smoothness.
Roundwound
Round wire wrap with a textured surface. This is the standard construction for most string lines, including our Power Wound Nickel and Power Steel Stainless electric strings.
Semi-Flat
Round wire wrap with a smoothed surface. Our Silencer Semi-Flat Nickel electric strings use our compression winding process. We describe them as sitting between the smooth feel of flatwounds and the bright, punchy tone of round wounds, with reduced finger noise. For acoustic players, our Silencer Semi-Flat 80/20 strings use a semi-flat polishing process to smooth the outer wrap.
Flatwound
Flat ribbon wrap, polished smooth. Of these three constructions in our lineup, Flat Wound Electric provides the smoothest surface, and it is the most distinct from a roundwound string. Our Flat Wound Electric set is built this way.
A semi-flat string is not a flatwound string with a different name. The wrap wire is different, and so is the way the surface is finished. If you want the full flatwound experience, choose Flat Wound Electric. If you want less texture without a big change in feel, semi-flat is worth considering.
How Flatwound Strings Feel and Sound
The feel difference is a matter of surface: a smooth wrap slides under the fingers, and it makes much less noise doing it. That is the one change we can state directly from construction.
Tone is harder to reduce to a rule. We describe our Flat Wound Electric strings as suited to jazz, R&B, and any style where a flatwound sound and feel is needed. We wouldn’t say flatwounds are simply “darker” or “warmer” in every setup. Pickups, amp, guitar construction, picking attack, and string age all shape what you hear, and the string surface is only one input.
If you want to know how a flatwound set sounds on your guitar, the most reliable way is to try one.
Material: Stainless Steel Ribbon Over a Steel Core
Our Flat Wound Electric strings pair a stainless-steel ribbon wrap with a steel core. This construction works with conventional magnetic electric-guitar pickups, which respond to the movement of the string within the pickup’s magnetic field.
Material and construction are separate variables. A flat ribbon wrap and a stainless-steel wrap are two different decisions, and they combine in this set. A different material in a flat construction, or stainless in a round construction, would be a different string.
Gauge: 11-50 and 12-52
Our Flat Wound Electric strings come in two gauges. The difference is a single step on each string.
| String | F1150 (11-50) | F1252 (12-52) |
|---|---|---|
| 1st | .011 | .012 |
| 2nd | .015 | .016 |
| 3rd | .022F | .024F |
| 4th | .030F | .032F |
| 5th | .040F | .042F |
| 6th | .050F | .052F |
The “F” marks a flatwound string. Both sets use a plain 1st and 2nd string and a wound 3rd.
Good starting point for 11-50 (F1150): a lighter flatwound set when you prefer less resistance under the fingers or already use a similar gauge.
Good starting point for 12-52 (F1252): a heavier flatwound set when you prefer more resistance under the fingers, already use a similar gauge, or want additional tension for a lower tuning.
The Wound G in Our Flat Wound Sets
Both of our Flat Wound Electric sets use a wound 3rd string: .022F in F1150 and .024F in F1252. That’s different from many modern electric guitar sets, which use a plain G.
If you’re switching from a plain-G roundwound set, don’t assume the 3rd string will feel or respond exactly the same just because its gauge number looks familiar. Construction matters along with diameter, and the wound G is part of the overall flatwound set design.
Does Gauge Change Tension?
Only when everything else is held constant. Tension depends on gauge, pitch, scale length, and string construction together. A flatwound string and a roundwound string of the same listed gauge don’t necessarily carry the same tension, because the wrap is built differently. We don’t publish tension figures for these sets, so we wouldn’t compare them directly.
Within our Flat Wound Electric line, 12-52 uses larger gauges than 11-50 on the same strings, so at the same pitch and scale length, it will be under more tension. If you’re moving between constructions (round to flat), treat the feel as something to confirm by playing rather than predicting from the numbers.
Is a Flatwound Set Right for Your Guitar?
Flatwound strings in our lineup are an electric guitar choice. Our Flat Wound Electric strings use a stainless-steel wrap, so they’re intended for use with a magnetic pickup. They aren’t an acoustic set, and they aren’t designed for an acoustic guitar’s pickup-less sound.
If you play acoustic and want less finger noise, our Silencer Semi-Flat 80/20 acoustic strings (GL1048, GL1150, GL1252, GL1356) are the relevant option. We don’t list a true flatwound acoustic set.
Setup is worth a check when changing construction. Changing gauge or construction can affect how a guitar plays. After switching, check relief, action, and intonation. A setup adjustment may be useful if one of those has changed enough to cause a problem.
How to Choose Flatwound Guitar Strings
- Confirm your guitar type. Flat Wound Electric is for electric guitar with magnetic pickups. For acoustic guitar, look at semi-flat.
- Decide how much smoothness you want. Of our three constructions, Flat Wound Electric has the smoothest surface. Semi-flat is a step between flatwound and roundwound. Decide whether you want the full change or a partial one.
- Choose a gauge. Start from what you play now. If your current set is 11-50, F1150 is the closest match in gauge. If you play 12-52, F1252 is. Experience level doesn’t determine the right gauge; what you’re used to does.
- Consider setup. Changing from round to flat, or changing gauge, can change how the guitar plays. Check action, relief, and intonation after the change.
- Consider alternatives within the family. If you want less texture but not a full flat feel, Silencer Semi-Flat is the next step. We also make a flatwound bass set; see our flatwound bass strings guide if you play bass.
Our Flat Wound and Semi-Flat Options
Flat Wound Electric Guitar Strings
Good starting point for: electric players who want the smoothest surface of our three constructions.
- Stainless-steel ribbon wrap over a steel core, polished smooth
- F1150 (11-50): .011, .015, .022F, .030F, .040F, .050F
- F1252 (12-52): .012, .016, .024F, .032F, .042F, .052F
- We describe them for jazz, R&B, and any style where a flatwound sound and feel is needed
Silencer Semi-Flat Nickel Electric Guitar Strings
Good starting point for: electric players who want reduced finger noise and a smoother feel without moving all the way to flatwound.
- Made with our compression winding process
- Sets: SL942 (Extra Light), SL946 (Rock N Roll), SL1046 (Light), SL1150 (Medium-Light), SL404RIC (12-string)
Silencer Semi-Flat 80/20 Acoustic Guitar Strings
Good starting point for: acoustic players who want less finger squeak and slide noise.
- 80/20 bronze with our semi-flat polishing process
- Sets: GL1048 (Extra Light), GL1150 (Pro Light), GL1252 (Light), GL1356 (Medium)
Changing to Flatwounds: What to Expect
A new set of any strings needs time to settle. Wound strings in particular can take a little while to stabilize after installation, so expect to retune a few times.
Don’t judge a flatwound set only by the first few minutes. The feel difference is immediate. The tone you’ll settle on may take longer to evaluate, especially if you’re comparing against a roundwound set that has been on your guitar for a while.
There’s no universal replacement schedule. Replace a set when you notice the signs: reduced response, corrosion or discoloration, trouble holding pitch, or intonation that no longer sets up cleanly.
Final Thoughts
Flatwound strings are defined by their surface: a flat ribbon wrap, polished smooth. That’s the one thing you can count on. Everything else, from tone to feel to how it works with your setup, comes from how the string works with your particular guitar.
If you want to try flatwound, our Flat Wound Electric set in 11-50 or 12-52 is the place to start. If you want to move partway, our Silencer Semi-Flat sets sit between roundwound and flatwound for both electric and acoustic.
Frequently Asked Questions
What are flatwound guitar strings?
Flatwound strings are wound with a flat ribbon of wire instead of a round wire, then polished so the surface is smooth. The wound strings in the set have very little surface texture.
What is the difference between flatwound and roundwound strings?
The wrap wire. Roundwound strings use a round wire, which leaves ridges on the surface. Flatwound strings use a flat ribbon with a polished surface. That changes how the string feels and how much noise it makes when you slide your fingers.
What is the difference between flatwound and semi-flat strings?
Semi-flat strings keep a round wrap wire but smooth the outer surface. Flatwound strings use a flat ribbon wrap. Semi-flat sits between roundwound and flatwound in surface feel.
Do flatwound strings eliminate finger noise?
We describe our Flat Wound Electric strings as having a flat feel without finger noise. Semi-flat sets reduce finger noise rather than removing it. Playing technique and string age also affect how much noise you hear.
Are flatwound strings darker or warmer than roundwound?
We wouldn’t reduce it to a rule. Tone depends on the guitar, pickups, amp, pick attack, and string age, as well as on the string surface. We describe our Flat Wound Electric strings as suited to jazz, R&B, and styles where a flatwound sound and feel is needed.
Which gauges do your flatwound electric strings come in?
11-50 (F1150) and 12-52 (F1252).
Is the 3rd string wound or plain in your flatwound set?
Wound in both sets (.022F in 11-50 and .024F in 12-52). The 1st and 2nd strings are plain steel.
Can I use flatwound strings on an acoustic guitar?
Our Flat Wound Electric set is designed for electric guitar and uses a stainless-steel wrap. For acoustic guitar, we offer Silencer Semi-Flat 80/20 strings, which smooth the outer wrap to reduce finger noise. We don’t list a true flatwound acoustic set.
Will flatwound strings work with my pickups?
Yes. Our Flat Wound Electric strings are designed for use with conventional magnetic electric-guitar pickups.
Do I need a setup after switching to flatwound strings?
Not always. Changing gauge or construction can affect how a guitar plays, so check relief, action, and intonation after switching. A setup adjustment may be useful if one of those has changed enough to cause a problem.
Is a flatwound set the same tension as a roundwound set of the same gauge?
Not necessarily. Tension depends on gauge, pitch, scale length, and construction together, and flat and round wraps are built differently. We don’t publish tension figures for these sets, so we recommend confirming the feel by playing.
How often should I change flatwound strings?
There’s no fixed interval. Change them when you notice reduced response, corrosion, trouble holding pitch, or intonation problems.
Do you make flatwound bass strings?
Yes. See our flatwound bass strings guide for details on our Power Flat set.
