This piece is made from Bioplast, which is completely biocompatible and nickel free. It is basically a softer type of acrylic, so you can bend it easily, which makes it great for surface piercings and keeping that navel piercing open when your pregnant.
You can even cut this stuff with scissors and rethread it with a ball. We carry it is very long lengths so that it is suitable for many locations. Also great to go through metal detectors at the airport and such.