Feature ArmorX™ piston coating for superior protection in extreme conditions and reduced wear, ArmorFit™ skirt coating auto-adjusts to the cylinder wall so there’s no need to measure clearance; provides smooth, quiet, trouble-free operation, Dome design for improved flame travel to maximize air/ fuel burn efficiency, High compression (11:1) for added power, Superfinish piston pin reduces friction and improves scuff resistance, Enhanced pin oiling for improved lubrication and reduced friction, Augmented ring land details improve ring seal and function, Dedicated rings for precise fit, improved compression and oil control, Fit OEM and Screamin’ Eagle cylinder heads, Kit includes two pistons, rings, piston pins and circlips, Made in the U.S.A