【STACKABLE】8 separate bed risers in a 4-set. 4 are 3" risers and 4 are 5" risers. By stacking a 3" riser on the top of a 5" riser, it makes an 8" riser. In that sense, you have 3 options of raising your bed 3", 5" or 8" up. 【SUITABLE FOR YOUR N-LEG FURNITURE】Some king size beds have 6 feet, 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 furniture, you can save much more space.【A MUST FOR SENIOR MOBILITY】If you have dodgy knees, making it a real pain to get out of very low bed or couch. Don't hesitate to buy it. After you level the bed up, you'll 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 1500 lbs