The VERTEX 2-stroke pistons are manufactured using a gravity casting process with an aluminum alloy containing 18% silicon. The addition of silicon helps to reduce thermal expansion during operation, making the piston less prone to rattling and breakage. Silicon also provides improved wear characteristics, extending the lifespan of the piston. This kit includes the piston, piston ring(s), piston pin, and circlips. VERTEX offers three types of pistons for 2-stroke engines: Replica, which matches the original design, Race, which is optimized for performance, and Pro Race, which is a specially forged piston.