These bed lifters are crafted from plastic. They have an extra 3 in. height, with an external size of 4.25 x 4.25 x 3.3 in. and an internal size of 3.25 x 3.25 x 0.6 in. The square-shaped risers are made of sturdy, anti-slip plastic that won't scratch floors. They're strong enough to handle heavy - duty furniture up to 2200 lbs. With a stacking design, you can stack them to get more height, and they can initially lift furniture to 3 inches. They're suitable for various home furniture like desks, chairs, sofas, couches, tables, cabinets, and beds. Using these risers not only provides more storage space but also makes it easier for the elderly to get in and out of bed. Moreover, the added height allows vacuum cleaners or robot vacuums to work more flexibly. Color: Black.