Floor Protection: The 2" swivel casters are made of polyurethane. 4 Pack Furniture Casters: Each transport caster kit contains 4 casters, each equipped with a brake. When you press the brake, the wheel locks, allowing you to move your furniture easily and safely. 360° Rotation & Heavy Duty: The swivel plate allows 360-degree rotation, making it easy to move around corners. Each caster is equipped with ball bearings. The 50mm diameter casters can support 160kg, and the 100mm diameter casters can support 600kg. Energy Saving: These heavy-duty casters save you time and energy when moving your heavy-duty projects. They adapt to different styles of furniture and walls. Easy-to-install moving casters with brakes: These heavy-duty casters are easy to install. They are suitable for hardwood, laminate, tile, etc.