Crawler Innovations is excited to bring a new material and design to the RC Rock Crawling, & Scale RC Crawling hobby / sport. This new design features a closed cell inner foam with a conventional outer. The closed cell inner foam is super dense, water proof, is not temperature sensitive and is extremely durable. The conventional outer foam is not temperature sensitive, but it is not water proof. The closed cell inner foams are designed for 1" wide bead locks. The outer foam is Over- Sized on purpose to encase the closed cell inner, and to provide for weight support. Sold as a pair. Features This is the shortest of the 1.9 closed cell inners and is designed for scalers weighing 5 - 6 pounds using tires 4.25" to 4.50"Tall.