1. - The bed and furniture risers are made of a strong plastic construction. Add more height to your bed or furniture without worry of the risers breaking with this heavy duty product. 2.- duty material of this product of use and maximum durability. Durably strong plastic 't give out under the weight. Sturdy plastic supports up to 1,200 pounds. 't scratch or dent hardwood floors. 3.Easy to use- Bed and furniture risers are super easy to use. Simply place risers in bed or furniture area and insert the bedposts to place on top the recessed of the risers. Recessed safety and that our bed or furniture do not slip and fall. 4.Convenient- Bed risers make for more convenience. Added height helps you get in and out of bed more easily, and it provides extra storage space under your bed. Make more efficient use of space. 5.Adjustable - Bed/furniture risers are adjustable. Customize the height of your bed or furniture with 3 convenient sizes - 3 ,5 or 8 inches by inserting your bedposts or casters into these bed risers. It works with a maximum bedpost diameter of 2.75 inches. Specification: Condition: colour: black Material: plastic size: 160x95x223mm Package Contents: 4 X Furniture Raiser(Large) 4 X Furniture Raiser(Small) Only the above package content, other products are not included. Note: Light 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.