Flexible Eyebrow Jewelry (Star). Flex barbells are the newest innovation in eyebrow jewelry. The flexibility of this jewelry reduces the chance of piercing rejection, and the common problem of jewelry “growing out”. The all new plastic design is hypo allergenic and also allows the addition of cool new disc decal designs. This jewelry is a great compliment to your eyebrow piercing. This jewelry the standard 16 gauge 3/8’’ , recommended for eyebrow piercings and features a star design.