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. Always verify chain length currently or previously in use. Gearing adjustments may require chain length adjustments. Use Tusk HD Chain Breaker #1389240001.