The Whipple Supercharger Pulley is designed for belt-driven supercharger systems, featuring a 4.75-inch diameter and 12 ribs for optimal performance. This individual pulley is manufactured by Whipple, a renowned brand in the industry, and is compatible with specific supercharger models. The pulley is a crucial component in the supercharger system, providing a reliable and efficient way to increase horsepower and torque in vehicles. New out if box pulley