Product Material: Self-adhesive swivel casters are made of durable ABS with three solid steel balls that provide a firm grip and a solid construction that will not age or rust, making them thick and durable. 360 Swivel: The swivel casters are designed with steel balls for unlimited free swiveling, stable and quiet, and will not squeak or make noise when moving, which will not affect your rest. They also make it easier for you to move items when cleaning. Fixed casters can also help reduce labor intensity. Easy Installation: Just peel off the film and stick the casters to the bottom of your furniture without drilling. For best results, it is recommended to use them 24 hours after attaching them. Screw mounting holes are available on each caster and there are two ways to use them. Please note that screws are not included. Load Capacity: The maximum load capacity is 50 kg for 4-ball casters and 100 kg for 8-ball casters. You can add more furniture casters if needed. The spherical design of the casters prevents them from scratching wooden floors, as they move smoothly and quietly. Versatile Use: Self-adhesive swivel casters are suitable for easily moving small furniture, drawers, and small appliances. They are perfect for small tables, desks, coffee tables, storage boxes, cabinets, flower pots, coffee makers, air fryers, coffee makers, kitchen mixers, toasters, microwaves, and much more.