The VERTEX Piston Kit designed for HONDA Pro Replica motorcycles is crafted to withstand the higher cylinder pressures typical of 4-stroke engines. These pistons are forged from the highest quality 2618 aluminum alloy to endure the internal pressure of the engine. To minimize wear and tear, each VERTEX piston is coated with MOS2 on the piston skirt. VERTEX is an OEM supplier for some of the world's leading motorcycle manufacturers, and numerous factory teams in the MXGP rely on VERTEX for top-tier performance. This kit includes pistons along with piston rings, piston pin, and piston pin clips. The 4-stroke Pro Replica pistons are forged to match the original form, while the Pro HC variant features a forged special piston designed for higher compression and performance enhancement.