Vertex Pistons 23335A Vertex Piston 05-21 Yamaha YZ 125 125cc +4mm Cast Big Bore Piston Kit 144cc.

Vertex Pistons, founded in 1953, is a manufacturer of high-quality pistons for powersports vehicles, including motorcycles, ATVs, and UTVs. They are known for their OEM replacement pistons and are the OEM supplier to manufacturers like KTM, Husqvarna, and Beta. Vertex utilizes both cast and forged manufacturing processes, producing pistons for various applications, from professional racing to recreational use. The company is headquartered in Italy and is part of the All Balls Racing Group.