Curved BioFlex retainer available in 2 sizes, Ideal for Eyebrow and Navel piercings. Secure the piece in place with BioFlex push fit balls.BioFlex is an excellent piercing material! BioFlex is highly bio-compatible. It reduces the chances of an allergic reaction to almost zero. BioFlex is adjustable. Just cut it with a sharp blade. Once the piercing has healed, the BioFlex shaft can be shortened again. BioFlex highly flexible and bends with the body for ultimate comfort.Tip: replacement o-rings can sometimes fall off and get lost, they are so tiny! Remember to purchase some spares to keep yourself organised, just in case.