Size: The diameter of each self-adhesive magnet is 20 mm and the thickness is 2 mm. Multiple self-adhesive magnets can be used together to enhance the magnetism. Strong adhesion: The adhesive on the back of the magnetic adhesive strips can permanently adhere to most surfaces, whether wood, plastic, metal or ceramic. Easy to use: You can easily tear off the sticking label from the protective film and quickly connect without leaving any residue. Flexible use: With our magnetic plate, you can insert photos, postcards, posters, paper and logos into magnetic plates and metal surfaces such as whiteboards, steel strips or refrigerators. Wide application: You can use it on the surface of the magnetic plate and metal surface such as photos, postcards, paper and logo. The strong self-adhesive magnet is a powerful assistant at school, at home or at home.