ProX X-CASTER-4-GR-100×80 are a set of (4) high-quality Industrial grade caster wheels, we aim to put quality first and ensure the safety and security of your gear, to make it easier on our customers during transport, and improve efficiency in your work load. Each caster is heavy-duty, swivels, is quiet, smooth, and easy to roll. Each caster is made from high-quality galvanized alloy and pvc. Casters can be used on ProX and most brand cases. It can also be used in film production, wardrobe, shelves, furniture, industrial cabinets, trailer support, etc.