1 x Standard Rear Sprocket 47t 1 x Standard Front Sprocket 11t 1 x Heavy Duty Chain 420H 126 Links High carbon japanese steel surface hardened pins for wear resistance. High carbon japenese steel rigid bushes to withstand a large pressure fitting force. Precision formed excellent impact resistance SWRCH 12A rollers. Leading edge in fatigue strength and rus free property plates. Be certain to select the appropriate motorcycle chain, length and assembly recommeded by the original equipment manufacturer for your equipment and intended use. For proper installation consult your owners manual. to fit motorcycle RS2 Matrix 50 & RS2 Matrix Pro 50