SCM415 chromoly steel alloy is used for the front sprocket, and ultra-durable high carbon C49 steel for the rear sprocket. JT X1R Heavy Duty Chains are constructed with quad riveted pins for an extra strong rivet that resists powerful lateral forces on the outer plate. X-Ring seals are used for a better seal and produce less friction than conventional O-ring chains. Fits: Suzuki GSX-R 600 01-05. Kit contains: 16 tooth chromoly front sprocket; 45 tooth steel rear sprocket; and JT 525X1R-110 link chain.