The caster cup, made of high-quality material, is practical and durable for long lasting use. It wont harm floors, prevents the scratches from casters and stops wheels from rolling. It is well anti-slide on a wooden floor or a smooth surface. Great for sofas, chairs, tables and other furniture. Features - Color:Black. - Material:Plastic + Felt.- Size:5.80X5.80X0.40cm/2.28X2.28X0.16inch.- Solid plastic and felt bottom design which wont harm floors and prevent the scratches from casters, stops wheels from rolling!- The stopper is well anti-sliding on a wooden floor or a smooth surface.- Make sure the floor is clean and then placed the stopper under the wheel of furniture.- It is important to note that the cleanliness of the floor determines the anti-slip effect.- It will fit to your bed with wheels, couch, chair, sofa, recliner, desk, table, dresser, piano, sofa, bed frame. Packing list: 16 x Furniture Stoppers