Music Wire, Carbon Steel Alloy 1085, Min. Tensile Strength (PSI) 316,000, Package Type Dispenser Box, Thickness 0.039 in / 0.991mm, Feet per Lb. 247.0, 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 Package of 6.