Nicely designed with great adhesion. Used on my ipads and iphones on existing magnets. Brilliant adhesion on the back of my my iphone 12 pro clear mag case. I use the small metal sticker on the top left corner. However was not great directly on the back of my iphone 12, although not much would stick to that as I think it must have silicon coating. Which was just as well as it needed to stick on the outside back of the clear mag case. Have been using it now for a few weeks and it still holds in my car magnet.