The universal metal ring sticker is made of metal and leather, which is stable and not easy to rust. It is light and will not increase the weight of the phone or interfere with the wireless charging function. TRecommended Application - It is recommended to stick it on PC or TPU phone cases without anti-fingerprint coating, can be used with, magnetic radiators, magnetic chargers, and car holders, and can experience faster and easier click-and-use wireless charging. A protective adhesive on the back will make it more firmly attached, so there is no need to worry about the phone falling off. With an alignment locator, you can quickly lock it in place. Tear off the metal ring protective film stick it to the outside of the phone, and make sure the surface is smooth and flat for good magnetism and effect. After installation, the ring can be removed but not repositioned.