Check the listing for details. Universal Plastic Magnetic Adapter Ring, 4 Pcs Sticker Ring, Black. Condition: New. Listed at 19.96 USD. The universal magnetic adapter ring is recommended to be attached to the outside of a TPU or PC standard cell phone case. This will help to strengthen the magnetization when attached to all magnetic accessories such as magnetic charging/phone grip ring/phone stand/car mount, etc.SpecificationColor: BlackMaterial: Nickel-Iron Alloy; Outer Diameter: 55 mm/2.17 InchInside Diameter: 45 mm/1.77 InchThickness: 1.3 mm/0.05 InchPackage List: 4 x Magnetic Adapter RingAdvantageThe metal ring sticker is not magnetic. The Metal Ring comes with a strong adhesive sticker that provides extra adhesion and magnetism to your phone so it can be securely attached to all magnetic accessories. It is designed to be ultra-thin and will not interfere with the wireless charging function.InstructionThe magnetic ring is very easy to install.