The latest concept in Body Jewelry - Flexible Bioplast? Belly Rings ? Bioplastic is increasingly the preferred material over Surgical Steel and Titanium as the flexible barbells allows for a more comfy fit, and they are hypoallergenic causing less irritation, swelling and infection. The 8mm and 5mm balls both Glow in the dark. Available in a variety of colors to match your wardrobe and mood! Barbell Size: 14 Gauge (1.6mm) Barbell Length 3/8? (9mm) Brand: FreshTrends Age: Adult Condition: New