The VERTEX two-stroke pistons are cast using a gravity casting process from an aluminum alloy that contains 18% silicon. Silicon reduces thermal expansion at operating temperature, making the piston less prone to rattle and breaking damages. Additionally, silicon gives the piston better wear resistance, significantly extending its lifespan. The piston kit includes piston ring(s), piston pin, and piston pin circlip! For two-stroke piston configurations, the Replica piston matches the original form, the Race piston enhances performance, and the Pro Race piston is a forged specialty piston.