JT Sprockets (JTSK1015AG) 520Z1R Gold Chain and 15 Front/43 Rear Tooth Sprocket Kit Fits: Honda CBR 929/954 RR 00-03; 520Z1R Gold Chain and 15/43T Sprocket Kit 520 Race Conversion Kit Contains: 15 tooth Chromoly Front Sprocket; 43 tooth Silver Aluminum Rear Sprocket; and JT 520Z1R-108 Link Gold Chain SCM415 chromoly steel alloy is used for the front sprocket, and lightweight 7075 T6 Aluminum for the rear sprocket JT Z1R Super Heavy Duty Chains are constructed with quad riveted pins for an extra strong rivet that resists powerful lateral forces on the extra thickness outer plates X-Ring seals are used for a better seal and produce less friction than conventional O-ring chains