●Plastic ●Heavy Duty Furniture Bed Risers ●Improved Ergonomics: Our heavy duty bed lifts risers 3 inch can help people with bed access for people with sore backs or impaired mobility by simply place the bed riser under bedposts to boosting the sit to stand process. ●Sturdy and Heavy Duty Support: We use three-dimensional design to make the black bed risers more sturdy, and the heavy duty bed risers can support up to 3,000 lbs when you use them together in 9 sets. ●Compatible with Most Furniture: The bed risers will fit for Twin, Twin XL, Full, Queen, King and Cal King size bed frame, and other furniture such as table, desk and couch. ●Creates Extra Storage Space: The furniture risers will raise your bed frame 3" high, which will provide more space to organize your products or make your under bed more easy to clean. ●Dimension of Bed Risers: The extra 3" high riser opening size is 3" x 3" x 3/4" deep, so please make sure your furniture legs diameter are not more than 2.75".