Feature fully boxed-style forging for ultimate strength, minimizing friction, durability, power, and weight reduction Full radius dome designs maximize quench while eliminating hot spots that promote detonation Internal bracing maximizes durability while decreasing friction in the pin assembly Forgings come standard with skirt coating which reduces friction, which in turn reduces heat Includes a DLC 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 conditions With the pistons each kit includes wrist pins, rings, & circlips as required Made in the U.S.A.. PISTON KIT KX250F 13.5:1