Black Annealed Wire: Specification 1 material: high quality mild steel 2 size: 15ga 16ga 16. 5ga 3 package: 10/ 12/ 16/ 20 rolls per carton 4 usage: Mostly used in construction and daily use as binding wire Feature Tensile Strength: 300 - - 400N/ mm ? Elongation: ?17% Good corrosion resistance Reasonable price and relialbe quality