Vertex Forged Race Piston Kit - Standard Bore 52.44mm 23621AWhen it comes to power and performance, Vertex four stroke pistons are hard to beat. Forged from the highest quality 2618 aluminum alloy, Vertex pistons are perfectly suited to handle the rigors and high pressures of todays modern four stroke engines. Plus, to aid in the break in process and reduce wear, every Vertex piston utilizes a unique Molybdenum Disulphide (MOS2) coating on the piston skirt. But, what truly sets Vertex apart from the