DID 520 VX2 X-Ring Chain (120 Links) (Gold/Black) D.I.D is the number one motorcycle chain in the world. D.I.D chains are used by factory races teams from all manufacturers in race series everywhere.D.I.D's Pro-Street X-Ring&reg; VX Series Chains are high quality X-Ring&reg; chains with superior strength to withstand the horsepower of today's dual sports and The VX Series uses D.I.D's patented low friction X-Ring&reg; for maximum performance.Greater rigidity (7% higher than previous VM chain) creates smother handling, reduced power loss and quicker response.Highest value in all D.I.D series.D.I.D X-Ring has h Normal O-rings and other makers' modified O-rings have squashed points that increase friction. The twisting action of the X-Ring&reg; disperses the pressure and minimizes power loss.1.5 to 2 Times Longer Wear Resistance - Compared with Normal O-ring chains, the X-Ring's four contact points greatly increase its sealing performance.