Features: Upgrade your phone or case with this 4 pack of stainless steel rings, enabling seamless wireless charging and accessory use. These rings (0.4mm thick) are made from premium stainless steel with smooth, none sharpened edges for safety, ensuring perfect coil alignment to maximize wireless charging efficiency and provide a secure magnetic grip. Designed for smartphone and tablet users, including phone owners seeking an upgrade and those needing multiple rings for sturdy mounting on larger devices. Ideal for attaching car mounts, phone stands, or wallets during daily activities such as driving, desk work, or home charging, offering versatile magnetic functionality. Enjoy easy installation with the adhesive backing and reliably durability, making these magnetic rings a sleek, low profile solution for enhancing your device's compatibility and user experience. Specifications: Component: stainless steel + double-sided tape Styles: black, white, brushed silver, letter black Size: inner diameter:45mm/1.77inch outer diameter:55mm/2.16inch thickness:0.4mm/0.01inch Package Includes: Pack of 4 Adhesive Magnetic Adhesives Stickers note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.