These fixed bead rings are a great idea - they look like a ball closure ring but are much easier to fit because rather than a fiddly ball to push out and fit it can be twisted open and closed by applying light pressure, the bead is fixed to one end of the ring.
They are made out of 316L Surgical Steel and have a gem set ball available in the following sizes:
0.8mm (20 Gauge) x 8mm internal diameter
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Easy Fit jewelled Ball Closure Ring with Twist Fastening