D.I.D's X-ring chains seal in their unique "V" grease while shutting out dirt and dust. With proper maintenance, this X-ring chain will sustain minimal wear and last up to 10x longer than your average chain. All D.I.D X-ring seals minimise friction by 50%, and guarantee a lifespan 50-100% longer than typical O-ring chains. Made with alloyed steel, with solid rollers and cylindrically precise bushings for minimal friction. The VX chains are slightly slimmer than other chain models. Clip included!