Due to the higher cylinder pressure in 4-stroke engines, the VERTEX piston is generally made from forged pieces. To withstand the internal pressure of the engine, the pistons are forged from the highest quality aluminum alloy (2618). Each VERTEX piston features a MOS2 coating on the piston skirt to reduce wear. VERTEX is an original equipment manufacturer for some of the largest motorcycle manufacturers, and many factory teams in the MXGP trust the performance of VERTEX. The VERTEX Top-End Piston Kit saves you time and money, as this set includes everything you need for a piston replacement. Delivery includes piston kit with cylinder gasket set and timing chain! Piston configuration 4-stroke: Pro Replica = forged piston corresponds to original form, Pro HC = forged special piston (higher compression and performance-enhancing). Whether you're an everyday rider or a competitive racer, this piston kit offers superior durability and efficiency, ensuring your engine delivers peak performance. Ideal for those looking to maintain the reliability and power of their Honda motorcycle. With this kit's high-grade components and exceptional engineering, you can trust it'll stand up to the rigors of high-speed racing or long-distance riding, offering you the confidence and reliability needed for top-end performance.