Anodized niobium jumprings are an ideal jewelry-making finding because they are naturally hypo-allergenic. Tammy Honaman explains more about this metal as well as jumpring size and color range. Shop: • Niobium jumprings: http://www.firemountaingems.com/shop/niobium-jumprings?wt.mc_id=YTZF13H_1 • Calipers and gauges: http://www.firemountaingems.com/shop/calipers?wt.mc_id=YTZF13H_2 Shop the jewelry-making supplies you need at http://www.firemountaingems.com