7075-T651 Aerospace aluminum construction, the strongest commercial grade aluminum chosen for maximum tooth strength to offer extended sprocket and chain life 100% surface anodized finish, critical to prevent oxidization caused by untreated aluminum, helps prevent the sprocket�becoming loose on the wheel CNC machined to provide perfect fitting to the bike hub CAD design allows the maximum removal of weight, while keeping core strength Grooved to prevent dirt build up�under chain and prolong chain life Factory tooth design, developed with factory teams, the wider and stronger tooth provides up to�20% longer sprocket life Larger�tooth radius reduces chain friction and extends chain life � Note: Image for reference only. Actual product may vary according to vehicle.