Vertex delivers with the 'Pro Race' 2-stroke piston a very lightweight and high-quality forged piston developed with VERTEX technology. The premium piston alloy ensures high wear resistance. All pistons are heat treated with a special T-5 or T-6 hardening and tempering cycle. The piston kit includes piston rings, piston pin, and piston pin circlip! Piston types for 2-stroke: Replica = piston conforms to the original shape, Race = performance-enhancing piston design, Pro Race = forged special piston.