The VERTEX 2-stroke pistons are crafted using gravity casting from an aluminum alloy with an 18% silicon content. This silicon component helps to reduce thermal expansion at operating temperatures. As a result, it significantly reduces the risk of piston slapping and breakage. Additionally, silicon improves the piston's wear resistance, thereby extending its lifespan. This kit includes the piston, piston ring(s), piston pin, and circlips! The 2-stroke piston variants are: Replica (matches the original form), Race (designed for enhanced performance), and Pro Race (forged specialty piston).