Niobium & Titanium Captive Rings - Our niobium and titanium captive rings and titanium captive beads are made from pure elements--no coating done here! These 100% guaranteed captive rings are precision-machined from your choice of flexible niobium or light-yet-strong titanium, anodized to the color you choose, and then hand-polished to a lustrous shine. Not sure whether to choose a niobium or titanium captive bead ring? Titanium is stronger than steel, but as light as aluminum, and it's great for use in body jewelry because of how it withstands the test of time. You'll likely need ring opening/closing pliers to manipulate a titanium CBR, but that's not the case with niobium captive rings. Niobium provides enough flexibility that you'll be able to open and close your captive rings by hand without weakening them.