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. CARBON STEEL REAR SPROCKET - BLACK BIKE FITMENT HUSQVARNA CR/WR 125 98-13 CR/WR 250 00-13 WR 360 92-03 TE/TC 250-450 01-13 GAS-GAS EC 125 97-14 EC 200 99-14 EC 250 94-19 EC 300 94-19 XC 250 18-19 XC 300 18-19 FSE 400 02-14 FSE 450 02-14 SHERCO SE-R125 18-24 SE-R250 14-24 SE-R300 14-24 SE-F250 08-24 SE-F300 10-24 SE-F450 04-24 SE-F500 19-22 SE-F510 07-14 BETA RR 4T 350RR 11-12 400RR 10-12 450RR 10-12 498RR 12-12 520RR 10-11