Suitable for avariety surfaces: brick wall, concrete wall, cement walls, stickers wall, wall, whitewashed walls, wood, wooden doors, wallpaper walls. No damage to the wall:One box included totally 40 pieces non-trace picture hangers. The biggest characteristic of each hook is that it not leave any marks , maintain the integrity of the wall, help to protect the wall from damage. Suitable for hanging art decorations of home, classroom and workplace such as clock, blackboard, photo frame, photo wall, small mirror, clothes, keys, umbrellas, metope adornment, bags, office pendantsand so on. Easy installation: Use a small hammer to nail the steel nails right into the position of the wall gently and no trace be left. Easy for hanging large and heavy objects like photos, paintings or other hanging ornaments., Weight: 0.17857443222 pounds, Manufacturer: Hipzeepo