Why does the larger piece not have adhesive like the small round piece? Noriko July 19, 2018 10:02 Updated Follow A. The larger piece is magnetic and will hold in place without the need for adhesive. Related articles How do you remove the magnet from the phone? Quick Guide How can I purchase additional magnet pads? With iPhone X, does your mounting device allow for horizontal positioning while in the car? Comments 0 comments Please sign in to leave a comment.