Motorcycle Chain 1. 40Mn, 45Mn quality alloy steel 2. carbonized harden 3. competitive price 4. trend to long cooperation Motorcycle Chain1)Model numbers:219H,35R,270H,420,428,428H,428HF1,520,520H,525,525H,530,530H,6302)Colors available:natural,yellow,blue,black3)Materials:carbon steel,nickel-plated,zinc plated,copper plated 525 525h motorcycle chain