RWM rubber tread wheels are constructed by molding high quality rubber to cast iron cores. All RWM mold-on rubber wheels are floor protective, provide long tread life, are quiet in operation and are highly resilient. Mold-on rubber wheels are popular and used in principally inexpensive applications such as trash containers, platform trucks, lumber carts and many manually pushed low cost applications. These wheels should be replaced as soon as they start to crack, chunk or tear apart. They do not handle overloading or towing. Although economical, the RWM mold-on rubber wheel utilizes a higher-grade rubber tread material that significantly outperforms wheels produced by other manufacturers. The standard RWM mold-on rubber tread is 75 durometer shore A. Keyways can be supplied on most sizes.