Suitable for hanging art decorations of home, classroom and workplace such as clock, blackboard, photo frame, photo wall, small mirror, clothes, , umbrellas, metope adornment, bags, office pendantsand so on. Suitable for avariety surfaces: brick wall, concrete wall, cement walls, stickers wall, lime wall, whitewashed walls, wood, wooden doors, wallpaper walls. No damage to the wall:One box included totally 40 pieces non-trace hangers. The biggest characteristic of each is it will not leave any marks on the wall, maintain the integrity of the wall, help to the wall from damage. Easy installation: 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 and heavy objects like photos, paintings or other hanging ornaments. Colour:white Material:Plastic + Steel Size:Extra : 2 x 5cm 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 photo hooks 4 x extra- hanging hooks 4 x multi-function frame support Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.