1. [Strong 3M Adhesive] The board uses the official 3M double-sided tape, which is not easy to peel off and guarantees a longer holding time. 2. [9 parts of 9 devices] The dimensions of the round and rectangular metal plates (diameter 40mm/45*65mm) are included in the scope of delivery. You include 9 magnetic plates, which can be used for 9 devices, and Can be used and shared with your partner or children or friends. 3. [Ultra-thin] A thin metal plate with a thickness of 0.3 mm can be invisiblely glued to the smartphone cover from the inside. Paste the protective film on the front of the metal plate on the back of the phone. It can protect your phone from scratches. 4. [Magnetic phone holder accessories] The metal plate is an accessory of the magnetic phone holder. Usually, it can replace the almost magnetic car phone holder, because the original metal plate has fallen off from the mobile phone or other equipment, so a new metal plate is needed. 5. [Easy to install] You can paste the metal plate on the back of the phone; paste the metal plate directly to the back or inside of the phone case. These car metal plates themselves are not magnetic, but they can be used in conjunction with all magnetic car phone holders.