Apico steel rear sprockets are manufactured using an aerospace grade light weight C45 Medium Carbon Steel. Cad Designed for enhanced tolerances and CNC machined laser cut profile for improved weight reduction and strength throughout. A standard feature with all Apico rear sprockets are the clearing grooves around the outer edges of the sprockets. Theses help to remove any build-up of mud and reduce ware and additional stress to the sprocket. Finished with a Cataphoresis Electro Coating giving them a unique look and unrivalled anti-corrosive properties. APICO STEEL REAR SPROCKET - BLACK 51T HONDA CR125 83-07 CR250 84-07 CR500 93-01 CRF250R 04-25 CRF450R 02-25 CRF250X 04-19 CRF450X 05-25 CRF250RX 19-25 CRF450RX 17-25 XR 250 98-11 XR 400 96-11 XR 650 93-21