Steinberger Standard Double-Ball Guitar Strings feature U.S.A. platinum-steel hexagon core for added tuning stability so they tune up fast and hold their tone longer. 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-Balls are the choice of Steinberger-fanatics worldwide. Gauges .009, .011, .016, .024, .032, .042.