Vertex cast or forged piston kit. Manufactured from the highest quality aluminum alloys and tempered to a T-5 or T-6 hardening and tempering cycles. Vertex produces unique piston profiles and compression ratios, offered in A, B, and C sizes to maximize power and performance while reducing blow-by and oil consumption. Aiding in the break-in process and reducing wear, every Vertex piston has a molybdenum disulphide (MOS2) coating on the piston skirt. OE supplier to KTM for 2-stroke pistons.