The VERTEX 2-stroke piston is cast using gravity casting from an aluminum alloy with an 18% silicon content. The silicon reduces thermal expansion at operating temperatures, thereby making the piston less prone to rattling and breakage. Silicon also imparts superior wear characteristics to the piston, thus extending its lifespan. The delivery includes the piston with piston ring(s), piston pin, and piston pin lock! The VERTEX piston kit comes in three types specifically designed for different purposes: Replica, which corresponds to the original form; Race, which enhances performance; and Pro Race, a forged specialized piston for superior racing performance. This Pro Race piston is the ultimate choice for those seeking the best in durability and performance for their Honda 2-stroke engine.