1. It can be adsorbed on the wall and used repeatedly. The suction surface is suction cup type, so you can attach it to the wall. No glue, removable cleanly and leaves no residue. With care, it is reusable and economical. 2. The magnet will stick to the surface: You can stick the magnet products or the included marker. Magnetic sheet products can also be used. 3. Since it is made in Japan, it will not fade even if you write overseas. Size: 11.8 x 8.3 x 0.04 inches (30 x 21 x 1.0 mm); About installation locations: Glass, mirror, plastic; Woodworking cosmetic board (woodworking furniture, wallpaper, etc.); Metal surface (surface does not rust or paint floats), steel furniture, refrigerator; Print wallpaper.