The VERTEX 2-stroke pistons are gravity cast from an aluminum alloy with an 18% silicon content. This silicon reduces thermal expansion at operating temperature, decreasing the risk of piston noise and breakage. Additionally, silicon imparts better wear resistance properties to the pistons, significantly extending their lifespan. Each piston kit comes complete with piston ring(s), piston pin, and piston pin retainer. VERTEX offers different piston configurations for 2-strokes: Replica (standard, OEM equivalent), Race (performance-enhancing design), and Pro Race (special forged piston).