The VERTEX Piston Kit for KTM, HQV, and GASGAS Pro HC models is expertly designed to withstand the increased cylinder pressure of 4-stroke engines. Each piston is forged from premium 2618 aluminum alloy, providing exceptional durability to endure the internal pressure of the motor. To minimize wear, every VERTEX piston is coated with MOS2 on the piston skirt. VERTEX supplies some of the world's largest motorcycle manufacturers as an OEM and is trusted by many factory teams in MXGP for superior performance. The kit includes a piston, piston rings, piston pin, and piston pin clips. The 4-stroke Pro HC version is a specialized forged piston with higher compression for enhanced performance.