STURDY BALL BEARING AND FLEXIBLE: With double ball bearings, swivel head, heavy-duty casters 360 degree swivel and move freely. The caster axle is double ball bearing swivel head, which is better than traditional solid bearings. So it can be used for years, even for frequent use and commercial use. Sturdy and durable: with the elasticity of rubber casters combined with the strength and durability of the metal structure, casters for furniture robust. Polyurethane casters won't scratch the floor, won't mark the floor, and are safe for all floor types. Flexible and Quiet: Heavy-duty casters rotate 360 degrees. Casters like a skateboard that move freely and smoothly, even on a hard surface. The wheels are sturdy and quiet. Easy to use: the castors come with the necessary screws and adapt very quickly. It's easy to install, even though we're not a natural DIYer. Multiple Uses: On any application as you can imagine, these heavy-duty casters can be used flexibly. Suitable for Home, Garage, Room: Perfect casters for furniture, chairs, bed casters, ottoman, coffee table, plant stands, bookshelves, toy bins, under bed storage bed, etc Suitable for office chair wheels, school, factory, shops, hospitals, carts, workbench; even for outdoor like garden gate wheels.