●Plastic ●【RAISE UP YOUR FURNITURE】Lift your bed, sofa, desks and any other furnitures 4" up at a low cost, with no need to change your furnitures. ●【SUITABLE FOR YOUR N-LEG FURNITURE】Some king size beds have 6 legs, while some other furnitures may have 9 legs. We have bed risers in 4-set, 6-set and 9-set. You can choose to match with your multiple-leg furnitures. ●【UNEXPECTED SPACE FOUND】By raising up the your bed or sofa, you can save much more space under them for storage. ●【A MUST FOR SENIOR MOBILITY】If you have dodgy knees, making it a real pain to get out of very low bed or couch. Dont hesitate to buy it. After you level the bed up, youll find they are really strong and do exactly what they are supposed to do. ●【SUPER STURDY & SOLID】Recommended maximum weight for the bed riser is 3000 lbs.