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All of the little rings should move freely around the big ring. Again, a very simple design, though untested. Order with caution! The inner diameter of the big ring is 8cm x 7cm, though it loses some width to the mini rings. (Not available in silver because of the moving parts--sorry!)
*Work in progress. The test worked, in that all of the little rings are free to move. Unfortunately, it's a little...um...huge. Will be fiddling with this.