1. A set of 4 booster seats (4 large and 4 small = 8 pieces total), ranging in height from 3 inches to 8 inches, adding a new level of comfort to your life.2. The riser is 2.8 inches wide and 0.7 inches deep, providing a sturdy foundation for furniture legs. The Extra Strong Bed and Furniture Lifter can be modified with three height options - up to 3 inches, 5 inches, and 8 inches (when combined) and has a maximum bedpost distance.3. When not in use, the bed frames can be stacked together to save space. The bed feet are securely mounted in the groove cups and can be easily used on any bed;4. The depth is 1.8 cm to hold the posts firmly in place. Made of sturdy plastic to withstand the weight of the heaviest furniture in your home or office, they can safely support a total weight of up to 600 kg.5. (When used with a bed frame) but please make sure you only use them when they are suitable Note: Risers are not suitable for recliners; also make sure the thickness of the furniture legs does not exceed 7 cm to ensure correct installation, thus providing a stable foundation for the furniture and minimizing the risk of collapse