PVD titanium or 316LVM surgical steel and metal alloy Austrian crystal Bezel-set External Navel Each piece is sold individually. The Four Jewel Chained Navel Dangle is a simple yet high-quality piece. The design of this barbell is especially for belly button piercings! The barbell unscrews from the top to slide into the piercing. If you need help sliding it in, use a dab of and slide it through. After that, screw the top on tightly to keep it in place. Titanium is hypoallergenic and bio-compatible. This is why you'll often find it in medical implants. Our yellow gold or rose gold jewelry gets its colour from physical vapour deposition (PVD). In other words, the desired gold colour vapour deposits onto the metal. As a result, the titanium looks gold, white gold, or rose gold. PVD is more durable and therefore longer lasting than traditional plating. Blackline is titanium carbide Physical Vapour Deposition (PVD). In other words, titanium carbide vapour deposits onto the metal. As a result, the titanium looks black. This process doesn't affect the hypoallergenic status. 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 Four Jewel Chained Navel Dangle is . This means the bead screws onto the post. The stones are Austrian crystals. Since they never lose their sparkle, they're our favourite stone. If you see it looking a bit dull, a quick clean bring the stone back to life. Don't forget to show us how you chose to wear yours with #BodyModsFamous on Instagram. We LOVE seeing our body jewelry out in the real world. And follow us on and for updates on new jewelry, product info, sales, and more.