Blackline titanium and metal alloy Austrian crystal Adhesive-set External Nipple Each piece is sold individually. The Bat Wings Nipple Barbell is a high-quality piece. The design best suits nipple piercings. This barbell unscrews from one side. Insert the barbell through your piercing and screw the end back on. If you need some help getting the barbell through, a dab of will get it through. Blackline is a titanium carbide PVD coating. PVD stands for Physical Vapour Deposition. In other words, the titanium carbide deposits onto the metal as a vapour. As a result, the titanium looks black. This coating is medical grade and hypoallergenic. A perk of using titanium under the blackline? Its porosity. Being porous means the PVD holds onto the metal better, and as a result, lasts longer. The charm is a metal alloy, which is ideal for casting and makes them perfect for jewelry with fine details. Many people have sensitivities to these alloys and may react. Metal Alloys with a PVD coating can help negate this reaction, but they may still irritate those with the strongest sensitivities. To avoid turning green, metal alloy jewelry is recommended to be cleaned often and not worn in moist/sweaty places. The stones are Austrian crystals. We love Austrian crystals they don't lose their sparkle like other similar stones. If your crystals start looking dull, a quick clean will bring them back to life. The crystals are adhesive-set, so it's important to avoid alcohol-based cleansers with this jewelry. Show us where you wear yours with #BodyModsFamous on Instagram. We LOVE seeing our jewelry out in the real world. Finally, don't forget to follow us on and for updates on new jewelry, product info, sales, and more.