Pro-Line Axial SCX6 1/6 Dual Stage 2.9" Crawling Foams are one of the best performance upgrades you can make to your SCX6. The inner inserts are made from lightweight and waterproof Blue Closed Cell Foam, while the outer is made from Soft Open Cell Foam. When combined they are perfectly sized for Pro-Line's 2.9" SCX6® Rock Crawling Tires such as the Hyrax XL (PRO10186-14) and Interco Super Swamper 2.9" Tires (PRO10201-14). The inner Closed Cell inserts are completely contoured to correctly match the shape of Pro-Line's tires for improved tire performance and appearance.