"Multi-Pack Glow in the Dark Barbells 4 Pack - 14 Gauge". "Hold under direct incandescent or LED light for 1-5 minutes to activate glow Exclusively at Spencer's Includes: 4 Barbells Piercing Type: Tongue Barbell Material: Bioflex Gauge: 14 Gauge/1.6mm Barbell Length: 16mm Ball Size: 6mm Threaded closure Jew... - "Multi-Pack Glow in the Dark Barbells 4 Pack - 14 Gauge".