High-strength steel sprockets transfer the power to the ground. Pro front sprockets are manufactured in house by JR Racecar, hardened and honed for superior quality. Teeth are located in the center for symmetry and radiused for smooth operation, unlike other sprockets on the market. Full keyways are cut for superior contact on your jackshaft. Available for 5/8'' or 3/4'' diameter jackshaft setups and for #35 or #415 chain. Sold individually.