It’s bot the kind of ring you can wear everyday. This is obviously for amusement only, and can be deemed as cute or gross, depending on your taste. The ring is made from glass.
This non-adjustable ring is available in three sizes. The diameters are 15 mm for Small (0.60 inches or 1.5 cm), 16 mm for Medium (0.64 inches or 1.6 cm), and 17 mm for Large (0.68 inches or 1.7 cm).