his is a set of Dual Stage Foams for 1.0" Rock Crawling Tires. Pro-Line is proud to introduce the latest and smallest addition to our popular line of Rock Crawling Performance Foam Inserts: the 1.0" Dual Stage Closed Cell Inner/Soft Outer Foam for small-scale crawlers such as the SCX24®!Pro-Line's inner inserts are made from lightweight blue Closed Cell Foam while the outer is made from Soft Open Cell Foam. When combined they are perfectly sized for Pro-Line's 1.0" Rock Crawling Tires. The Soft outer foam provides maximum grip while maintaining a fully supported sidewall from the inner Closed Cell foam for maximum side-hilling performance. These inserts are perfectly contoured to correctly match the shape of Pro-Line's tires for improved tire performance and appearance.