The APR Supercharger Pulley is a high-performance, billet construction drive pulley designed for specific models of Audi vehicles. With a diameter of 57.75mm, this pulley features a unique design that allows for 2 spins of the charger, resulting in a 9.5% increase in speed for enhanced torque and horsepower. The pulley is manufactured by APR and crafted from durable T304 stainless steel, ensuring longevity and reliability. Additionally, it comes in a sleek black color with an anodized and E-coated finish, adding a stylish touch to the vehicle's exterior. Perfect for enthusiasts looking to upgrade their supercharger system for improved performance.