materials: made of plastics, these bed risers have circular raised contact surfaces to enhance friction, stability, shock absorption and floor protection, and reduce noise. Package: This set includes four black bed risers. Light and strong, it is an ideal choice for supporting heavy furniture, and not take up too much space. Functional design: Raise your furniture, not only to facilitate the cleaning of robot vacuum cleaner, but also to create additional storage space. These lifters can easier for the elderly to stand up from the sofa and adjust the height of the workbench to relieve back pain. Ease of use: just put these risers under any furniture, and you can reach the ideal height. They can be stacked for further ascension. Note: For safety reasons, avoid excessive stacking to prevent instability. Multifunctional application: It is very suitable for lifting chairs, desks, sofas, tables and beds with casters. These lifters improve your living or working space by adjusting the furniture to a more comfortable height, which helps to prevent shoulder and neck pain. Colour:As Shown Material:plastic Package Contents: 8 * Furniture Heights Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.