Billet Crank Sprockets from Boundary follow the same heritage as our their pump gears, manufactured 100% in house with US sourced materials. These sprockets start with a chromoly steel that is 10 times stronger then the OEM powdered metal, hot quenched with a low temper for the highest strength and resistance to wear. All sprockets heat treated to maximum hardness while maintaining toughness Precision CNC machined and broached for snug accurate fit Dimensions checked after machining and after heat treating for guaranteed fit. 80% more cross section versus OEM at the keyway Weighs 30% more then OEM at 170 grams vs 130 grams giving the highest strength sprocket on the market. High finish reduces friction and chain vibration New tooth geometry strengthens teeth and keyway