[High Quality rubber]Polygon shape bed caster cups are made of rubber, odorless and safe to use. 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 clean can maximize the anti-slip effect of the furniture cups. [Fits Most Wheels]The outer size is 74mm x 59mm x 17mm, and the inner size is 64mm x 47mm x 11mm, our furniture wheel stoppers suitable for most wheels. [Widely Used]Furniture will stopper casters will protect 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 that the installation does not affect your cleaning measures such as dust collection; Material:rubber colour:grey Package Contents: 4 x Furniture caster cups Only the above package content, other products are not included. Note: Light reflection 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.