Features:1. STURDY STEEL MATERIAL: Adjustable furniture risers made of heavy-duty strong Solid Carbon Steel, which can stand the weight of the heaviest of furniture in your home or office. They won't crack like other risers. 2. SCREW CLAMP FIXED & NOT FALL OFF: Use screw clip adjust fixing, wrapped furniture legs are not easy to fall. Suitable compatible sofa, couch, table, desk and easy to install.3. ADJUSTABLE WIDTH: Adjustable widths are 1-3.7cm, can increase the height by 5cm and 10cm respectively.4. INCREASED ADDITIONAL HEIGHT: Adds additional height not only storage space under beds but also added height allows vacuum cleaners or robot vacuums to work more flexibly. They also make it more convenient compatible the elderly to get in and out of bed. 5. PROTECT YOUR HARD FLOORS FROM SCRATCHES: Heavy duty and smooth edges would safely handle the weight without causing any dent or crack on hardwood or hard surfaces. Protect your hardwood, ceramic tile, and linoleum floors from marring and scuffs.Specification:Material: Plastic Product Color: Black, Brown Product Size: 5cm, 10cm Product Weight: 180g, 305g, 360g, 610gPackage Included:2 / 4 x Adjustable Furniture Risers