... steel 2. color : blue, black, yellow and natural A series roller chainsSpecification:1. Simplex: 03C, 04C-1, 06C-1, 085-1 ... -1, 32A-1, 36A-1, 40A-1, 48A-1.2. Duplex: 04C-2, 06C-2, 085-2, 08A-2, 10A-2 ... ANSI standards.Color: blue, black, yellow and natural industrial transmission chain (A series)