Wanda Industrial PU on PP Wheels also known as TPU Caster Wheels are injection molded from a blend of polyolefin/polypropylene polymers forming a one piece design that is solid and will not de-laminate. Polyolefin Wheels are great for wet and corrosive environments while providing a high impact resistant wheel. Polyolefin wheels are more economical compared to a Phenolic Wheel or a Steel Wheel. These wheels are non-marking and light in weight. Black is the standard color on plastic wheels.