[High Quality] Round shape bed caster cups are made of durable rubber, odorless and safe. Solid rubber design will not harm your floor and prevents scratches from casters, keeping your furniture firmly in place. [Prevent Scratches] Protects hardwood floors and tile-like surfaces from scratches or damage. Keeping the contact surface clean maximizes the anti-slip effect of the furniture cups. [Fits Wheels] Outer size is 84mm x 8mm; inner size is 67mm x 36mm x 5mm. Suitable for most furniture wheels. [Widely Used] Furniture stoppers protect various floor surfaces from indentation caused by bedroom or household furniture. Ideal for hardwood, linoleum, laminate, ceramic tile, and carpet. Safe and effective for use with beds, couches, chairs, desks, tables, sofas, recliners, dressers, bed frames, and more. [Easy Installation] Simply place the product under the four wheels of the furniture to effectively secure it in place without movement. Installation does not interfere with cleaning. Color: Gray Material: Rubber Package Contents: 4 x Furniture caster cups Note: Light reflection and different displays may cause the color of the item to appear slightly different from the real thing. Measurement allows an error of +/- 1-3cm.