This Captive Bead ring is made from Niobium, and has a Hematite stone bead. Niobium is hypoallergenic, and these rings are annealed to make them easier to work with. Niobium rings are slightly heavier than stainless steel rings.
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these earrings are great! comfortable and easy to insert and the bead stays in place. I have the largest diameter ones and in an ideal world id prefer a slightly larger diameter and a heavier bead like my titanium ones.