These are a Solid 14k Gold Ring with only one break in the ring. They give you the same look as the Segment Rings, but are also available in the smaller gauges. With these rings, you either twist the ring like a spiral to open it (in the smaller gauges) and close it, or you use the Ring Opening and Ring Closing Pliers (for the larger gauges). Either way though, these rings are really very easy to work with.
The Gold used in this Piece is Totally Nickel Free, and available in either; solid 14K Yellow or White Gold.