-Custom designed by EHX and made in the USA -Available in three sets: Super Light (09-42), Regular Light (10-46) and Medium (11-48) -Plain strings are round high-carbon steel wire -Wound strings feature round nickel-plated steel that’s precision-wrapped onto hex-shaped, high-carbon steel core wire -Nickel-plated steel provides optimal magnetism for use with electric guitar pickups plus a comfortable, smooth feel -The quality of the steel, the precision of the string and core diameters, and the high-tech computer-controlled winding process result in strings that intonate better and stay in tune longer