[High Quality] Round shape bed caster cups are made of durable rubber, odorless and safe to use. 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 protective effect of the furniture cups. [Fits Most Wheels] Outer size is 84mm x 8mm, inner size is 67mm x 36mm x 5mm, suitable for most furniture wheels. [Widely Used] Caster cups protect floor surfaces from indentation caused by bedroom or household furniture. Safe and effective for use on hardwood, linoleum, laminate, ceramic tile, and carpet. Fits beds with wheels, 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 tasks such as dusting. Color: gray Material: rubber Package Contents: 4 x Furniture caster cups Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 1-3cm.