VERTEX 2-Stroke pistons are cast using a gravity casting process from an aluminum alloy containing 18% silicon. The inclusion of silicon reduces thermal expansion at operating temperatures, providing the advantage of making the piston less susceptible to rattling and breakage. Additionally, silicon imparts better wear resistance to the pistons, thereby extending their lifespan. The piston kit includes piston rings, piston pin, and piston pin clips. Variations of 2-stroke pistons available: Replica (matching the original form), Race (performance-enhancing), Pro Race (forged special piston).