Keep your piercing open when it needs to become invisible with this Bioplast horseshoe. Bioplast is a biologically inert material which will not react with your body – making it safe for body piercings. When wearing this piece, all that can be seen is clear plastic when up close. Bioplast retainers are the perfect, virtually invisible solution for school, work, sport, x-rays and surgeries. Suitable for Eyebrow, Ear, Tragus, Rook and Cartilage. 16 Gauge and various diamters to suit, with 3mm balls.