Music Wire, Carbon Steel Alloy 1085, Wire Gauge Number 13 American S & W Music Wire Gauge, Min. Tensile Strength (PSI) 328,000, Package Type Dispenser Box, Thickness 0.031 In. / 0.787mm, Feet per Lb. 390, Application For Springs, Wire Forms, Control Linkages, Armature Binding, Ceramic Cutting and a Variety of Industrial Uses, Pack Count 1, Meets/Exceeds Meets ASTM A228