This is a button ring from the Osaka designer brand, NECESSARY or UNNECESSARY. This product was created through a unique process, unprecedented worldwide, where all manufacturing steps (cutting, dyeing, lettering, and polishing) were specially processed in a button factory. Made of plastic, it's safe for those with metal allergies. The NECESSARY or UNNECESSARY engraving goes all the way around the outside! You can wear it stacked with other rings or on its own, and arrange it to match your outfit or mood. The size is probably a size 11. (Sorry if I'm wrong)