1.These metal plates have 3M adhesive on the back.
2. Secure 3m metal plate which will not come off in cold or hot weather.
3. These car metal plates themselves are not magnetic, but they can work with all magnetic car phone mount holder.
4. Rectangular and Circle metal magnetic plates to attach device onto magnet mounts.
5. Great to use with smartphones and tablets magnet mounts.
6. The magnetic plate mount easily sticks to the back of devices for easy mounting and very easy to attach without a hassle.
7. Works with magnet mounts designed to hold devices with the metal plate.