These hooks are self adhesive which make them easy to apply to a wall without the need to drill holes. The hooks are supplied with 3m Command Adhesive Strips and adhere to most smooth surfaces such as painted walls, tiles, metal and wood. The strips can hold up to 1kg so are perfect for holding wall hangings and prints. About - Made from sustainably sourced birch plywood - Approx 4cm-5cm in diameter - The wood grain may vary from that shown in the photos - Decorative use only. Do not hang items above cots or within a child’s reach. How to use - Your hook will arrive with the strip attached on the back - If your wall has been freshly painted, please wait 7 days before applying the hooks - Remove the liner from the strip - Press the hook sticky side down firmly against the wall for 30 seconds - Wait one hour before hanging anything from the hook, this will allow for the adhesive to fully adhere to the wall.