Piston Kit - 81.00 mm - Gas Gas | Husqvarna | KTM R&D developed to provide dyno-proven power gains, Asymmetric skirt design for improved wear and even loading on major thrust skirt, Precision fit ring; custom-lapped compression ring for improved power, 100% billet machined for superior strength-to-weight ratio and optimized fit, High compression (14:1 for 450cc, 14.5:1 for 250cc) for maximum torque and throttle response, Dome design improves flame travel to maximize air/ fuel burn efficiency, DLC-coated piston pin reduces friction and improves scuff resistance, Enhanced pin oiling for improved lubrication and reduced friction, Pressure seal groove reduces ring lifting and power loss, ArmorGlideA(R) skirt coating reduces friction for quieter operation, improved scuff resistance, Pistons include rings, pin, and circlips, Made in the USA