This is a set of Crawler Innovations "Deuce's Wild" Heavy Duty 1.9" Single Stage Crawler Foam, featuring CI's dense car stand foam, cut and shaped into a complete inner tire foam. This dense inner offers superior steering response and a firm foundation for your tire while being 100% waterproof. In high power applications, these foams support the tire so that it can drift across the surface. These foams provide a firmness not widely found on the market and don't fold and bend as others do, despite the load or speed. These foams rely on a small air gap between the foam and the tire, which allows the tire to obtain traction while supported by the foam.
This insert was designed for use in the Pitbull Tires 1.9 Rock Beast Tire (PB9003NK - standard height) but will fit many other brands of tires as long as they are similar in height and width. Examples are the RC4WD IROK, and the Ottsix KLR. The Heavy Weight height is the same height as the original CWR-3001.