DID is original equipment manufacturer of many Japanese and European brands. Leading racing teams in the Road and off road sports rely on the technology of DID. DID 520ATV: The 520ATV X-Ring Chain has been designed to meet the unique needs of quads and ATVs. A special steel alloy provides high strength to withstand the stresses especially in quad racing. The patented X-rings also minimize frictional losses through the chain and guarantee a long service life. - especially suitable for ATV and quad Gold-colored outer straps, black inner straps (G & B Gold and Black)