Abs,rubber Half Side Design; the L shaped bed risers raised edge allowing you to slide bed risers under the legs easily; 2 side raised edge also makes the risers to easier to match different furniture legs. Oversized Bed Risers; The widened and enlarged top surface provides a 4.5x4.5 inch contact area?which provides a strong stability, even heavy duty furniture Extra conveniences; This bed risers not only can elevation furniture to 5 inch to create extra space for storage, but also can lifts furniture up to makes your home easy to clean Heavy duty bed risers; durable ABS material with reinforced ribs, these bed risers can support up to 6000 lb. therefor a twin, king, queen bed will be feel steady Anti-Slip & Floor Protection; the taper at the top to prevent furniture from sliding; the rubber bottom layer can effectively absorb shock and protect the ground from scratches