These command hooks with a 225g holding power, are easy to apply, without the need for nails, screws or drills. Blending in seamlessly with décor, these discreet clear hooks provide damage-free hanging and clean removal. The strips stretch off without leaving holes, marks or sticky residue, making them suitable for most smooth surfaces including painted walls, tiles, metal and wood.See usage instructions: After attaching to the wall wait 1 hour before hanging anything on the hook/strip. Ideal for solid, hollow and painted walls. Do not use on wallpapers, vinyl surfaces, or other delicate or weak surfaces. Do not use on windows.