The 520EXW Gold XW-RING Chain's metal components are made from a specialized high carbon steel alloy that is shot peened, heat treated, and pre-stretched to create a chain that lasts for an incredibly long time. So tough in fact that it will outlast other 520 chains by 10%. Factors that make the EXW such a long wearing chain also include the anti-corrosion, gold tinted surface treatment and the unique design of the EXW's O-ring, which has an additional sealing surface to retain more lubricant. With an 8,500 pound tensile strength, RK has made this chain strong enough for any off-road application that has a 750cc displacement or less.