Disc Diameter 9cm/3.54 Inches: The shape of this mini wall mounted shelf is round, and the diameter of the disc used to hold items is 9cm/3.54 inches. With Self-Adhesive Adhesive: Each small shelf comes with 2 self-adhesive adhesive, you don't need to drill holes to stick the product on the wall. And the self-adhesive is non-marking, when you need to remove the product, the self-adhesive will not leave a mark. Wait 24 hours: to ensure the stability of the self-adhesive, please do not place any objects after you use the product to stick on the wall. Wait 24 hours before placing anything. With Cable Holes: With two rectangular holes on the side for usb charging cable. It can bring you more convenient experience. Wide Applications: The display shelves are also can be used to hold small vase, smart speakers, succulent plants, earphones, napkin, small decors, switches, key, remotes, seasoning bottle and other items.