VERTEX 2-stroke pistons are manufactured using gravity casting from an aluminum alloy with an 18% silicon content. The silicon component reduces thermal expansion at operating temperatures, which makes the piston less susceptible to rattling and breaking. Additionally, silicon provides better wear resistance, thereby extending the lifespan of the piston. The package includes the piston, piston ring(s), piston pin, and piston pin circlip! Piston variants for 2-stroke engines include: Replica (piston in original form), Race (high-performance piston variant), and Pro Race (forged special piston). This is a reliable choice for your Yamaha bike, ensuring superior performance and longevity.