Niobium Heart Seamless Split Ring. Made from Niobium with available sizes:16g (5/16″ 3/8″). Seamless rings offer a sleek style to almost any body piercing. Free from the seams of a segment or clicker hoop or the captive bead of a captive bead ring, seamless hoops create an understated aesthetic for those who prefer subtle styles. These rings appear to be continuous but are opened and closed by twisting the ends sideways, carefully. Most commonly worn in the nose and ear.