These are for raising the legs of furniture. They are made of wood-grain plastic. The height can be adjusted (up to about 2.5cm). I bought these to raise the height of a chair, but as I used them, the adhesive surface shifted, making them unsuitable for chairs. They should be fine for furniture that is placed on the floor, even heavy items. Bottom diameter: 70mm Top (adhesive surface) diameter: 50mm Height: 50mm (when the screw is tightened) The screws are about 30mm long. You can raise the height by a maximum of about 25mm. Adhesive tape for the adhesive surface is not included. Please use strong double-sided tape. Felt is attached to the bottom. There are 16 in total. Please comment if you need them.