This is a pair of 1.9″ Single Stage Closed Cell Foams for Rock Crawlers. Pro-Line is proud to introduce our next generation of Rock Crawling Performance Foam Inserts: the all-new 1.9″ Single Stage Closed Cell Foam! Pro-Line’s new inserts are made from lightweight and waterproof Blue Closed Cell Foam and they are perfectly sized for Pro-Line’s 1.9″ XL sized Rock Crawling Tires. These new inserts are completely contoured to correctly match the shape of Pro-Line’s tires for improved tire performance and appearance. Deep grooves along the top of the foam provide a softer feel for more grip while maintaining a fully supported sidewall for maximum side-hilling performance. Pro-Line’s new Closed Cell foams are extremely durable and will last through many rugged adventures.