OTXEER 9 colors metal ring for wireless charger Outer diameter: 2.16 inch / 55mm Inner diameter: 1.77 inch / 45mm Thickness: 0.02 inch / 0.5mm Material: Special steel, will not rust, can be adsorbed by magnetsColor: green, silver, purple, pink, red, white, rose gold, light blue, black - Must know before buying The metal rings only compatible with PC or TPU phone cases, not compatible with silicone cases, leather cases, uneven surfaces or cases with rubber coating. - Metal rings work with wireless charging accessories The Ring sticker can compatible with iPhone 14/13/12/11/X/8 series, the Samsung Galaxy S21, and more. The rings can be used as long as the device can be charged with Apple Charger, Wallet, Battery Pack,etc.. - Why choose metal ring sticker When you charge your phone with wireless Charge, Wallet or Battery Pack, it keeps them connected to your phone more firmly.With these metal rings, keep your wireless charger firmly attached to the center of your phone, where charging is most efficient.With these metal rings, your phone can be attached to the car mount that supports wireless charger. - You can get 1 x A card to help you install9 x Metal Ring Sticker - Very easy to install Place the auxiliary installation card on the back of the phone case, Observe the tick marks around the card and align the center hole of the card with the center of the phone as much as possible, Tear off the protective paper on the back of the metal rings, then gently place the metal ring into the center hole of the card, After waiting for 12 hours, you can charge your phone with the wireless charger. - You can fix metal rings of different colors on your phone case, so that the back of your phone case will become beautiful and technical, no longer monotonous.