Material:Metal wire Feature:Using pliers, straighten out the "hook" on the opening end of the ring so that beads and charms can be threaded onto the wire. Close the ends by bending the end back to its original hook form. The rings can then be attached to the stem of the wine glass,perfect for keeping track of guests glasses during parties, gathering, get togethers, shin digs, etc. They open easily ? like an earring ? and fit neatly around your average wine stem. This way guests can tell if a glass they pick up is theirs. It prevents people from drinking other people's wines and keeps people from using multiple glasses, which keeps you from having to do a bunch of dishes. What's more they can be used on other kinds of glasses beyond wine. They'll sit just as comfortably around the stem of a martini glass, champagne flute, even the handle of a coffee mug! Plus, they look great! Size:Approx.25mm dia,Inner Dia.23mm X 0.7mm Thick