Due to the higher cylinder pressure of 4-stroke engines, VERTEX pistons are 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 is coated with MOS2 on the piston skirt to reduce wear. VERTEX is an OEM supplier 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 because this set includes everything you need for a piston replacement. Delivery includes: piston kit with cylinder gasket set and timing chain! Piston design 4-stroke: Pro Replica = forged piston corresponds to the original shape, Pro HC = forged special piston (higher compression and performance-enhancing). With the VERTEX Top-End Piston Kit, you ensure that your engine runs smoothly and efficiently. The precision craftsmanship and high-quality materials guarantee longevity and optimal performance, making it a favorite choice for both professional racers and motorcycle enthusiasts alike.