The Strong Ventilation Phone Holder Comes with a magnetic 3M Piece as well as the mount. The Magnetic circle provided is to be placed on top of any case used for the device. By doing this it allows for the mount and magnetic piece to have strong grip between one another ultimately providing the best possible grip for bumpy rides without fear of the device falling. This mount is easy to use, you simply press the clip into your ventilation and it will lock in place; that's it. You are ready to go place the magnetic strip on the phone by removing the plastic covering the 3M strong glue stick it against your case allow for 2-3 cooling press with pressure to ensure proper stick.