VERTEX 2-stroke pistons are manufactured using gravity casting with an aluminum alloy containing 18% silicon. The silicon content reduces thermal expansion at operating temperatures. This advantage results in pistons being less prone to rattling and fracture damage. Additionally, silicon provides better wear resistance, extending the piston’s lifespan. The piston kit includes the piston, piston ring(s), piston pin, and piston pin circlip! Piston versions for 2-stroke engines: Replica = piston matches the original form, Race = performance-enhancing piston design, Pro Race = forged special piston.