The Vertex Big Bore Piston Kit is designed to enhance engine performance by increasing displacement, torque, and peak horsepower. For 2-stroke engines, the pistons are made from gravity-cast aluminum alloy with 18% silicone content, ensuring a balance of lightweight construction and strength. For 4-stroke engines, the pistons are forged from 2618 aluminum for superior durability. High-compression 4-stroke pistons improve power and torque across the entire RPM range. All pistons undergo a T-5 heat treatment process for hardening and tempering. The piston skirts feature a molybdenum disulfide (MoS2) coating, which reduces friction, speeds up break-in time, and extends piston life. Each kit includes a piston, rings, wrist pin, and circlips, serving as a high-quality replacement for OEM components.