VERTEX 2-stroke pistons are gravity cast from an aluminum alloy with 18% silicon content. The silicon content reduces thermal expansion at operating temperature. This advantage makes the pistons less prone to knocking and breakage. Additionally, silicon provides the pistons with better wear characteristics, thus extending their lifespan. The piston kit includes piston rings, piston pin, and piston pin clips. Piston variants for 2-stroke engines: Replica (piston conforms to original shape), Race (performance-enhancing piston design), Pro Race (forged special piston).