New 16g (1.2mm) seamless niobium rings Available in various diameters from 5/16” (8mm) through 3/8” (10mm). These rings are high quality niobium. Not that fake stuff you find elsewhere Niobium is a soft metal which allows for easy ring manipulation, thus no annealing process is necessary. The seamless ring design leaves a small gap between the rings two flat ends which is virtually unnoticeable. You may order these in a variety of colors. Choose your favorite color and size below!