... and natural A series roller chainsSpecification:1. Simplex: 03C, 04C-1, 06C-1, 085-1, 08A-1, 10A- ... 1, 32A-1, 36A-1, 40A-1, 48A-1.2. Duplex: 04C-2, 06C-2, 085-2, 08A-2, ... 2, 32A-2, 36A-2, 40A-2, 48A-2.3. Triplex:04C-3, 06C-3, 08A-3, 10A-3, ... 28A-3, 32A-3, 36A-3, 40A-3, 48A-3.Material: alloy steelQuality: With superior alloy steel and ... blue, black, yellow and natural industrial transmission chain (A series)