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. 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 will not leave any marks , maintain the integrity of the wall, help to protect the wall from damage. Easy installation: Use a small hammer to nail the steel nails right into the position of the wall gently and no trace will be left. Easy for hanging large and heavy objects like photos, paintings or other hanging ornaments. Colour:white Material:Plastic + Steel Size:Extra large: 2 x 5cm Large size: 2 x 4cm Medium: 1.5 x 3cm Small: 1.5 x 2.5cm X card slot: 4 x 4cm Package Contents: 20 x small hanging hooks 8 x medium frame hooks 4 x large photo hooks 4 x extra-large picture hanging hooks 4 x multi-function frame support hook Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.