Vortech 8-Rib Supercharger Pulleys are machined from 6061 T-6, hard anodized aluminum with the proper profile to maximize surface contact area for precise fit. Each pulley is built to SAE standards. This pulley measures 3.33" in diameter.
Please Note: A change in one pulley size will usually effect boost 1-2 PSIG. A general understanding is down in diameter, up in boost and vice versa.