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 525VX: The development of the 525VX is based on the many years of experience of DID in MotoGP and meets even the highest demands with the use of the patented X-rings. Compared to the O-ring-equipped V-Series, the 525VX has higher strength and better performance a higher wear resistance. - high durability and low friction due to patented X-ring Gold-colored outer straps, black inner straps (G & B Gold and Black).