These Training Chair with Rolling Wheels & Tablet is equipped with wheels (also known as casters) that are designed to roll smoothly on various types of flooring. The casters are usually made of high - quality materials such as polyurethane or rubber. Polyurethane casters provide excellent durability and a smooth roll on both hard floors (like tile or hardwood) and carpets. Rubber casters offer good traction and are quieter when moving around.