These beautiful bracelets are shell bangles, which pop open on one side and have a hinge on the other. They are very delicate but since they pop open they fit most wrists. Even mine, and my wrists are huge!
Rose Gold Plated.
Internal Circumference: 170mm
Internal Diameter: 57mm
These bangles are quite soft and bend easily, but they seem to be quite resilient and easy to pop back into shape if you do bend them.