Just flip them up inside of your nose when you need it hidden.
These are really high quality pieces, we highly recommend them!
9mm inner diameter.
NOTE, Gorilla Glass has updated the shape of their retainers, these no longer have curved sides (they are straight on each side with no curve)
Additional Info: Glass is a hand made material so it can slightly vary in size, color, and shape. All of our glass pieces are guaranteed to be within 1mm of the stated size. If you need an exact measurement or better description of the item, feel free to email us before ordering. Glass is also a fragile material and can break if dropped or not handled correctly.