DID is the OEM supplier of many Japanese and European brands. The main road racing and off-road sports teams are based on the technology of DID. DID 428HD: G & amp G As a successor to the 428H, a new technology for roll production was used in the 428HD. Until now, the roles were wrapped in metal strips, whereby a seam and therefore a weakness emerged. Using the new technology, rolls of round material and a seam avoided. Compared to the standard 428D chain the 428HD is reinforced by thicker plates and therefore has significantly higher tensile strength. - 20-50% higher wear resistance than DID 428H - increased - Gold color forming internal and external plates