Enjoy roaming the halls of the school undetected? This ring will ensure you don't forget the words to unlock the map and reveal the whereabouts of everyone in the castle. Grab your invisibility cloak and watch out for Filch (and Mrs. Norris, too). When you are done, don't forget to turn the map blank or someone will be able to read it too!
The surface size is 11/16 inch (1.8 cm) diameter
The size of the ring is adjustable, smallest size around 6.5
- The ring is made of copper. If you are allergic to metal, avoid wearing it for long periods of time. Or you can coat a clear nail polish on the metal part to avoid allergy. It works!