ENHANCED GRIP AND SUPPORT The Pro-Line PRO6174-00 consists of a pair of two 1.9 Dual Stage Closed Cell Foam Inserts designed specifically for Pro-Line 1.9” XL Rock Crawling tires. These inserts feature a unique dual-stage construction, optimizing performance for rock crawling enthusiasts. SUPERIOR MATERIALS FOR DURABILITY These inserts are crafted with a lightweight and waterproof blue closed cell foam for the inner layer combined with a soft open cell foam outer layer. This specialized material construction ensures maximum durability during rugged use. OPTIMIZED FOR ROCK CRAWLING Designed to perfectly fit Pro-Line's 1.9 XL rock crawling tires, the soft outer foam enhances grip, while the supportive closed cell inner foam bolsters the sidewalls, which is essential for side-hilling performance. Experience the rugged terrain with confidence, knowing your Pro-Line 1.9 XL tire inserts are engineered for durability and performance, ready for all your rock crawling adventures.