[High Quality rubber]Round shape bed caster cups are made of durable rubber, odorless and safe to . Solid rubber design will not harm the your floor and prevent scratches from casters, make your furniture in place firmly. [Prevent Scratches]so no matter the hardwood floor or tile-like floor will not be scratched or damaged.Keeping the contact surface clean can maximize the anti-slip effect of the furniture cups. [Fits Wheels]The outer size is 84mm x 8mm, and the inner size is 67mm x 36mm x 5mm, our furniture stoppers suitable for wheels. [Widely Used]Furniture will stopper casters will any floor surfaces from the indentation of bedroom or household furniture. For any floor-hardwood, linoleum, laminate, ceramic tile, carpet, etc., it is safe and effective. Fit to bed with wheels, couch, chair, desk, table, sofa, recliner, dresser, bedframe etc. [Easy installation] Just put the product under the four wheels of the furniture, it can effectively fix the furniture or bed without moving, so the installation does not affect your cleaning measures such as dust collection. Colour: black Material: rubber Package Contents: 4 * Furniture caster cups Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.