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I assume you are referring to a CBR (captive bead ring). Here's BMEzine's wikipedia definition of it

http://wiki.bmezine.com/index.php/CBR

The ball has two dents in it that the edge of the metal fits into. There's nothing you screw on; it just snaps in place. If it's too loose, the ball can fall out. I might have swallowed a lip ring ball once because of that.

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15y ago

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