High-Performance 4-Stroke Piston KitFeature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reductionFull radius dome designs maximize quench while eliminating hot spots that promote detonationInternal bracing maximizes durability while decreasing friction in the pin assemblyPiston kit includes wrist pin, rings, & circlipsMade in the USADesigned for aftermarket flat valves.