This is a pack of two Crawler Innovations Lil' Nova 1.9 x 4.20" Dual Stage Crawler Tire Inserts. These inserts feature a standard inner foam, with a soft density outer foam. Crawler Innovations has brought a unique material and insert design to the crawler world that will dramatically improve the performance of your rig. The Lil' Nova design features a closed cell inner foam combined with a conventional over sized outer foam insert. 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 4.25 Size is the recommended for light weight scalers weighing less than 6 pounds. The Standard Inner Foam Width fits 1" wide bead lock wheels and the outer foam is Over-Sized on purpose to encase the closed cell inner, and to provide for weight support