The VERTEX 2-stroke pistons are gravity cast from an aluminum alloy with an 18% silicon content. The inclusion of silicon reduces thermal expansion at operating temperatures, which makes the piston less prone to seizure and fracture. Moreover, silicon enhances the piston's wear resistance, thereby extending its lifespan. Each piston kit comes complete with a piston ring(s), piston pin, and pin lock. VERTEX offers three piston variants for 2-stroke engines: Replica (OEM form), Race (performance-enhancing), and Pro Race (special forged piston).