DID is the OEM supplier of many Japanese and European brands. Major road racing and off-road sports teams rely on DID's technology. DID 428HD: As a successor to the 428H, a new technology for producing rolls has been used in the 428HD. Until now, the roles were wrapped in metal strips, whereby a seam and thus a weakness emerged. Using new technology, rolls of round material and a seam are avoided. Compared to the standard 428D chain the 428HD is reinforced by thicker plates and therefore has a significantly higher tensile strength. - 20-50% higher wear resistance than DID 428HD - increased