Plastic STRONG AND DURABLE PREMIUM MATERIALS: This upgraded bed risers L shaped is made of high-quality heavy-duty plastic to withstand the weight of the heaviest furniture in your home or office, the bedrisers4pack can easily support up to 6,600 lbs, features a 0.75 inch L-shaped raised edge to securely hold furniture legs in place. 4 PACK TO MEET YOUR NEEDS: This furniture risers 4 inch black can raise your furniture up to 4 inches high, the 4inbedrisersheavyduty opening diameter is 4.5 inches, can accommodate legs with a diameter of 4.5 inches, (the diameter of the cleats 3.8 inches) with an overall height of 4.8 inches, a bottom diameter of 6.1 inches, and a single set weight of 4.4 lbs, which can meet your exact needs for 4 bed legs. EXTRA STORAGE & EASY CLEAN: The bedrisers4inch4pack can raise your bed up to 4 inches, a perfect solution for small bedrooms and dorms with limited storage space, the 4inchbedrisers not only adds the extra height your bed needs and added extra storage space under the bed, allowing you to stack clutter or storage boxes, and help the robot sweep clean floors, making it easier to clean the bottom of the bed and keep the bottom of the furniture free of dust and grime. UPGRADED ANTI-SLIP STUDS: The L-shaped edge design makes the whole bed look more three-dimensional and refined, the upgraded 4 deskrisers adds anti-slip studs to each surface, and adds 4 rubber anti-slip strips at the bottom, which will neither damage your bed The furniture can also allow your furniture legs to be firmly installed in the nail surface, without any tilting and shaking of your furniture, whether it is a bed, sofa or table chair, it can firmly fix your furniture. UPGRADE BED RISER L SHAPE: The L shape furniture risers 4 inch heavy duty is suitable for lifting all types of furniture, including beds, sofas, tables, chairs, etc., can be used for heavy furniture, and the bottom rubber anti-slip strip protects your furniture and floors from damage , compatible with most sizes and furniture, the bed furniture risers 4 inch also helps improve sleep quality and helps those with back pain.