... *Materials:Superior alloy steel The service life of O-Ring Motorcycle Chain is greatly depended on the wearing between the pin-shaftand ... recommend the no. 1 in Chinese chain association, berecommend to worldwide.- Model: 420,428, 428H,520, 520H, 525, 525H, 530, 530H, 630 ... : Natural, Blue, Brown, Nickel, Copper- Packing:Color box O-Ring Motorcycle Chain 420,428,428H,520,525,530,630