-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 ORM O-Ring chain provides outstanding durability and long wear characteristics making it perfect for motorcycles and ATV's. -Features solid bushings with pin material, O-rings and lubricant. -The unique design and profile of the chain ensures durability, and decreases wear on chain guides and swing arm rub plates. -Average tensile strength 7,850 lbs. -Clip style Master-Link included. -Kit includes countershaft spacer.