... alloy steel *The chains are especially suitable for the adverse environmentsaasuch as the one bearing water ... and the sleeve. The "O" ring or “X” ring will greatly reduce the wearing and thus ... 530VM, 630V, 630VM,428V-X,428VM-X,520V-X,525V-X,530V-X,530VM-X,630V-X,630VM-X,420HZ,428HZ,520NZ,525HZ,530HZ, ... sealing performance of X-ring is better than O-ring. X-Ring Motorcycle Chain for honda/yamaha/suzuki