20G Glass Labret Flat Back Retainer Piercing Barbell With Clear O-Ring 1/2 Inch 13mm - Pack of 4 Measurement: Piercing Thickness Gauge: 20G (0.8mm); Labret Flat Back Barbell Length: 1/2 Inch (13mm) Material: Made of Clear Pyrex Glass & Clear O-Ring ; Safe Material, Hypoallergenic and Nickel Free, Harmless Your Skin. High Polished Surface, Very Smooth to Wear and Easy to Clean. 20G-8G Labret Flat Back Glass Retainer Piercing Clear Earrings Cartilage Piercing Jewelry 1/2 inch 12.5mm - Pack of 4 Specifications:Material: Clear Pyrex Glass & Clear O-RingThickness Gauge: 20G, 18G, 16G, 14G, 12G, 10G, 8GFlat Back Labret Length: 1/2 Inch (13mm)A nice touch to your daily life! All Piercing Jewelry Design & Popular as Labret Piercing Jewelry. Perfect For Auricle, Cartilage, Helix, Lip, Lobe, Medusa, Pinna, Rim, Snake Bites, Spider Bites, Monroe, Labret, Tragus and a mix of other piercings.