[Unique rubber caster cup design] It can lock the furniture or bed wheel in place, while protecting the hardwood, ceramic tile, linoleum and floor surface from the indentation of the bedroom or home furniture. Safe and effective, suitable for any floor-hardwood, linoleum, laminate, ceramic tile, carpet, etc.[Unique anti-skid design] The bottom is smooth, using electrostatic adsorption technology, so that the furniture casters can slip on the wooden floor or smooth surface. Therefore, it is difficult to move on the floor and has a lot of friction.[Size] 24 black furniture coasters are round 3 inches (approximately 7.6 cm), which is very suitable for almost all furniture rollers-1.8 inches wide (approximately 4.8 cm), depth 0.2 inches (approximately 0.5 cm). 24 non-slip caster cups, each cup can hold 550 pounds (250 kg).[High-quality raw materials, easy to use and clean] The caster cup is made of rubber material, no odor, no harm to the human body, and durable. Simply slide under the bed wheels or furniture legs to instantly protect your floor and keep the furniture still. Easy to clean and can be cleaned with water.[Wide range of applications] This fun stopper can fit your bed, equipped with wheels, couches, chairs, sofas, recliners, desks, dressers, pianos, sofas, bed frames. Our rubber caster cup will stop it all at oncecolour: blackMaterial: rubberPackage Contents:24 x floor non-slip padsOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.