Acoustic Strings

What is phosphor bronze in guitar strings?

Quick Answer

Phosphor bronze is a copper and tin alloy with a small amount of phosphorus added. On acoustic strings it's the outer wrap wire over a steel core, typically around 92% copper and 8% tin, often written as 92/8. It gives a warm, rich tone with clear highs and a full low end.

Despite the name, phosphor bronze strings aren't mostly phosphorus. The phosphorus is a minor addition to the copper and tin. Only the wound strings use it. The plain top strings on an acoustic set are steel.

How it compares:

  • 80/20 bronze: 80% copper and 20% zinc. Brighter and crisper.
  • Monel: a nickel and copper alloy. Warmer, drier and more vintage.
  • Coated phosphor bronze: the same wrap with a treatment that resists corrosion.

Phosphor bronze is the starting point of our acoustic range. Tone also depends on gauge, construction, the guitar and how you play, so material is one part of the picture.

S.I.T. options:

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