A series roller chains 1. material: alloy steel 2. color : blue, black, yellow and natural A series roller chainsSpecification:1. Simplex: 03C, 04C-1 ... , 28A-3, 32A-3, 36A-3, 40A-3, 48A-3.Material: alloy steelQuality: With superior alloy steel and advanced workmanship, all ... .Color: blue, black, yellow and natural industrial transmission chain (A series)