The VERTEX TopEnd Piston Kit for Honda Pro Replica is crafted to endure the higher cylinder pressure inherent in 4-stroke engines. Generally forged from premium-grade aluminum alloy (2618), the VERTEX piston stands resilient against internal engine pressures. Each piston features a MOS2 coating on the piston skirt to minimize wear and tear. As an OEM supplier for some of the largest motorcycle manufacturers and trusted by many factory teams in the MXGP for its performance, VERTEX pistons are a top choice for serious riders. The VERTEX Top-End Piston Kit saves you time and money, as it includes everything you need for a piston replacement. The kit comes with a piston, cylinder gasket set, and timing chain. The 4-stroke piston versions are Pro Replica for a forged piston matching the original form and Pro HC for a special forged piston offering higher compression and enhanced performance.