Forgeline SO3 The Forgeline SO3 is a classic Performance-Series version of their popular SO3P five-spoke Premier-Series wheel. The stepped-lip and raised spokes give this wheel a very aggressive look. Every SO3 wheel is built with true forged 6061-T6 aluminum centers, heat-treated aluminum rim shells, and aircraft-quality stainless steel ARP fasteners. They feature a standard powder coated center finish and polished outer lip. The SO3 is available in sizes ranging from 17"√ó7" to 18"√ó15". And since each wheel is built to order, we can offer special features like custom offsets, center locking hubs, and a choice of finish combinations. Three-Piece Performance Series Wheel Stepped-Lip Design Aircraft-Quality Stainless Steel ARP Fasteners Generous Brake Clearance Forged 6061-T6 Aluminum Heat-Treated Rim Shells Includes Standard Aluminum Center Cap Customizable Fitment and Finish Options Legendary Forgeline Quality and Customer Service