Designed to withstand the increased cylinder pressure of 4-stroke engines, the pistons in the VERTEX Piston Kit HONDA Pro Replica are crafted from high-quality forged aluminum alloy (2618). This ensures superior strength and durability to handle the internal pressures of the engine. To further minimize wear, each VERTEX piston features a MOS2 coating on the piston skirt. VERTEX is a trusted OEM supplier for some of the largest motorcycle manufacturers, and many factory teams in the MXGP rely on VERTEX for top-tier performance. The kit includes the piston, piston rings, piston pin, and piston pin clips. The Pro Replica series consists of forged pistons that match the original form, while the Pro HC series features special forged pistons designed for higher compression and power enhancement.