... taken measures to better antirust6.long-life duration and high strength7.pre-stretched and anti-fatigue8.produce as your sample or drawing9 ... .sound quality,reasonable price and prompt delivery are what we persue10.Packing:1pc packing in ... , 420, 420H, 428, 428H, 520, 520H, 530, 530Ha. O-Ring and X-Ring Motorcycle chains: 428SO,520SO,525SO,530SO4. Silent chains: SC3,SC4 ...