The latest concept in Body Piercing - Flexible Bioplast&#153 Eyebrow Barbells ? Bioplastic is increasingly the preferred material over Surgical Steel and Titanium as the flexible barbells allow for a more comfy fit, and they are hypoallergenic causing less irritation, swelling and infection. The two 3mm balls Glow in the dark for a unique and funky look. Available in a variety of colors to match your wardrobe and mood! Barbell Size: 16 Gauge (1.6mm) Barbell Length 5/16? (7.9mm) Brand: FreshTrends Age: Adult Condition: New