This ring works great for keeping my wallet or magsafe charger secured to my phone, through the material of the case. It’s easy to install, strong, fits perfectly into my agood case, and is highly reusable. The magnets are held together by some kind of plastic layers on both sides, I don’t know if this is the same biodegradable material that they use elsewhere. But the ring isn’t glued or molded into the case so it should be reusable with all of my iPhones in the future.