The VERTEX 2-Stroke Pistons are produced by gravity casting using an aluminum alloy with an 18% silicon content. The inclusion of silicon helps reduce thermal expansion at operating temperatures, minimizing the risks of piston slap and fractures. Additionally, silicon enhances the wear resistance of the pistons, significantly extending their lifespan. This kit includes the piston, piston ring(s), piston pin, and piston pin circlip. VERTEX offers various piston designs for 2-stroke engines: Replica pistons match the original shape, Race pistons are designed for performance enhancement, and Pro Race pistons are forged for special high-performance needs.