PRICES MAY VARY. Plastic Dimensions of bed riser-- Extra 3" High. The external size: 4.25 * 4.25 * 3.3 inch. The internal size: 3.25* 3.25* 0.5 inch. Material -- Square shaped bed riser is made of sturdy and surface adopts high-tech printing wood grain,avoid moth and wood thorn,light and strong.It can handle heavy duty furniture up to 2200 lbs. Stacking design -- Bed lifters give perfect elevation with stackable option, can lift furniture to 3 inches, and you can also stack them to get more heig