Captive bead rings are often abbreviated as CBR, and are sometimes called ball closure rings (BCR).
They can be used in almost any type of piercing, and they can even help your piercing heal faster. The size or gauge size of the bead ring depends on the piercing type and/or your preferences. To open the captive bead ring, you usually need a special tool called a ring opener, and large gauges may require a large ring opener. To close the ring you will need ring closing pliers, or large ring closing pliers for large gauges. However, these tools are not necessary for acrylic rings, as they can easily be opened and closed by hand.
How captive bead rings are measured:
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