*Sprocket kits include the following. *Stock size Primary Drive steel front sprocket. *Stock size Primary Drive Alloy rear sprocket. *Stock size Primary Drive X-Ring chain. *Front sprockets are manufactured to O.E.M., specs using high grade hardened steel. *Rear Aluminum Sprocket made from 7075 T-6 heat treated Aluminum. *Come with self-cleaning grooves. *All match original equipment exactly for perfect fit and size. *The ORH X-Ring chain is Primary Drives best off-road chain for performance and durability. *X-Ring shape provides an outstanding seal with reduced friction. *Average tensile strength 8,120 lbs.