Power transmission chain 10A: 1)OEM offered 2)manufacture type:A /B/JIS series 3)hot sale market:mid east,south America,etc 1 ... ,chain material:40mn2,the roller chain quality have A,B ... kinds of motorcycle chains ,satandard or OEM are accepted 1)Type :420,420H,428,428H,530,630 and so on 2 ...