The VERTEX Piston Kit KTM Pro HC is meticulously engineered to withstand the higher cylinder pressures inherent in 4-stroke engines. Each piston is crafted from high-quality forged aluminum alloy (2618), ensuring exceptional durability and strength. To reduce wear and enhance longevity, every VERTEX piston features a MOS2 coating on the piston skirt. Trusted by some of the largest motorcycle manufacturers and numerous factory teams in MXGP, VERTEX stands as a symbol of superior performance. The kit includes a piston, piston ring(s), piston pin, and piston pin retainer. The 4-stroke Pro Replica is a forged piston that matches the original form, while the Pro HC is a specialized high-compression piston designed to boost performance.