My boyfriend has one similar to the Sean Michaels one, but it has only one bead. It won't slip and loosen so don't worry about that. The bead fits very snugly onto the rubber tubing it is threaded on. Moving it is not as easy as it looks. I would think that this sort of ring would be better than most others because you can adjust it to fit you exactly. It's the only one I have experience with, though.
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Most people go through life dreading they'll have a traumatic experience. Freaks were born with their trauma. They've already passed their test in life. They're aristocrats. - Diane Arbus
PESSIMISM, n. A philosophy forced upon the convictions of the observer by the disheartening prevalence of the optimist with his scarecrow hope and his unsightly smile. - Ambrose Bierce
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