The VERTEX TopEnd Piston Kit for Honda Pro Replica is specifically designed to endure the higher cylinder pressure of 4-stroke engines. VERTEX pistons are generally made from high-grade forged aluminum alloy (2618) to withstand the motor's internal pressure. Each VERTEX piston is equipped with a MOS2 coating on the piston skirt to reduce wear. Trusted by many factory racing teams in the MXGP, VERTEX serves as the original equipment manufacturer for several leading motorcycle brands. The VERTEX Top-End Piston Kit is a time and cost-saving solution, as it includes everything required for a piston replacement. The kit comes with a piston, cylinder gasket set, and timing chain. The 4-stroke Pro Replica piston is a forged piston that matches the original shape, while the Pro HC version is a special forged piston designed for higher compression and performance enhancement.