The VERTEX 2-stroke pistons are gravity cast from an aluminum alloy containing 18% silicon. The addition of silicon reduces thermal expansion at operating temperatures, which makes the piston less prone to rattling and fracture damage. Furthermore, silicon enhances the wear resistance of the pistons, thereby extending their lifespan. The package includes the piston, piston ring(s), piston pin, and piston pin circlip! Available in different variants for 2-stroke engines: Replica (matches the original form), Race (performance-enhancing design), and Pro Race (forged special piston).