These threadless straight barbells are manufactured out of Implant Grade Titanium (Ti-6AL-4V-ELI ASTM F136). Ideal for nipple, tongue, or bridge piercings, but can also be used for ears in some cases. By using a 4mm threadless flat disc on one end, these can be made in to Labrets (best used in lower lip, cheek, medusa, monroe, helix, conc...