Unlike our electric strings, acoustic & classical SKULLS are coated. This is the case with Phosphorus-bronze, Soft Brass and Silver-plated alloys.
But then again, SKULL STRINGS doesn’t do what everyone else does! While your strings are protected by an anti-sulfuration varnish that gives them incredible longevity, SKULL STRINGS innovates by coating not the string, but the wrap wire itself. This means optimum protection without a complete coating (which would alter the sound) between your string and your pickup.