VERTEX 2-stroke pistons are produced using gravity casting from an aluminum alloy with 18% silicon content. The silicon reduces thermal expansion at operating temperature, which makes the piston less prone to rattling and breakage. Additionally, silicon enhances the wear characteristics of the pistons, extending their lifespan. This piston kit includes the piston ring(s), piston pin, and piston pin clips. Piston types available for 2-stroke: Replica - matches the original form, Race - performance-enhancing design, Pro Race - forged special piston.