High-Performance 4-Stroke Pro Race Piston KitPro Race Piston increases the durability by reducing the stresses in the pin bore area and allowing the pin to flexFull radius dome designs maximize quench while eliminating hot spots that promote detonationInternal bracing maximizes durability while decreasing friction in the pin assemblyCome standard with skirt coating which reduces friction, which in turn reduces heatIncludes a DLC (Diamond-Like Carbon coating) wrist pin; this technology has been proven and used because of its high resistance to abrasive wear, which extends the service life and reliability under extreme conditionsKit includes piston, wrist pin, rings, and circlipsMade in the USA