Guaranteed to meet official Steinberger string length, twist diameter, twist length, and ball diameter. No other strings perform as well. Steinberger Double-Ball strings feature U.S.A. platinum-steel hexagon core for added tuning stability so they tune up fast and hold their tone longer. Nickel-plating adds warmth and improved overall tone. No matter what style of music you play, you'll hear why Steinberger Double-Ball strings are the choice of Steinberger fanatics worldwide. Gauges: .095, .075, .060, .040.