The ultimate bright-sounding bass string. These strings start with a 92/8 phosphor bronze under-wrap wire over a hard-tempered hexagonal steel core. Then, the "Fusion Winding" process, exclusive to S.I.T. uses an electrical calibration technique to integrate the strings cover winding with its core. This innovative method fuses a string into one super flexible mass, eliminating dead spots that occur during the strings life. These RB (Rock Bright) bass strings are available in a variety of gauges and combinations including long and extra-long scale. All RB bass strings are made with USA made cover-wrap wire over USA made hexagonal core. These strings are available in either Nickel (NRB) or Stainless Steel (SRB).