The latest concept in Body Piercing - Flexible Bioplast&#153 Tongue 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 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 5/8? (16mm) Brand: FreshTrends Age: Adult Condition: New