High quality and high load: these fixers are made of plastic and nails are made of high quality iron. Can be nailed into wooden walls, gypsum walls and plaster walls. Easy installation: place the hook close to the wall, and then gently knock four nails into the wall one by one with a hammer. No need to drill holes, only one hammer is needed for the whole installation. Invisible and traceless: Compared with ordinary hanging picture hooks, these hanging picture hooks leave only four small pinholes after being removed, which are almost invisible. Minimize damage to the wall. Applicable walls: widely used in most walls, such as plaster walls, gypsum walls, wallpaper walls, wooden walls and concrete walls. Very suitable for hanging pictures, photos, clocks, paintings, mirrors, clothes, bags and so on. Tip:These picture hooks may not be suitable for some particularly hard concrete walls and stone walls. Colour:White Material:Plastic Package Contents: 30 * No trace hook Only the above package content, other products are not included. Note: Light reflection 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.