The Tetrahedral Amorphous Carbon (ta-C) coating is an advanced DLC (Diamond Like Carbon) coating applied on the surfaces of the bushings and the rollers of the HPE Chain, combining high hardness with a low coefficient of friction Eliminates the need of periodic re-lubrication, while ensuring at least the same mileage obtained with a normal chain regularly lubricated every 310 miles (EU: 500 km) Reduces energy dissipation and increases efficiency in the chain drive Eliminates lubricant spatter during operation, minimizing environmental impact For use with steel sprockets only.. CHAIN 137HPE 108LINKS 525