The VERTEX Piston Kit for KTM, HQV, and HUSABERG Pro HC models is engineered to withstand the higher cylinder pressures typical of 4-stroke engines. Crafted from the premium 2618 aluminum alloy, the pistons are forged to provide exceptional durability and resilience. Each VERTEX piston features a MOS2 (molybdenum disulfide) coating, which significantly reduces wear on the piston skirt. Trusted by some of the world’s leading motorcycle manufacturers and numerous MXGP factory teams, VERTEX pistons offer unmatched performance and reliability. The kit includes the piston, piston ring(s), piston pin, and piston pin circlip. The 4-stroke models include different types such as the Pro Replica, which is a forged piston retaining the original shape, and the Pro HC, a forged special piston designed for higher compression and performance enhancement. Note: Compression ratio 12.4:1, FE 450!