Electrostatic Dissipative As casters roll across surfaces an electrical charge is generated. A static dissipative material has medium resistance to electrical flow. This means a static dissipative caster wheel allows electricity to flow through the unit. The static electricity flows through the ESD material and is released into conductive flooring as opposed to being transferred through the cart and materials being transported. RWM ESD wheels are perfect for carts used within manufacturing plants transporting sensitive goods such as computer chips, circuit boards and any other electronics requiring ESD protection. FEATURES Tread Material - Rubber Wheel Bearings - Precision Ball Bearing Wheel Core Material - Polypropylene Temperature Range - -40°to +120°F Hardness - Standard 85A