Labret CZ Medusa Stud Cartilage Earrings (Lip Stud) 16 Gauge Can be used as a labret, monroe, tragus or medusa piercing. Stainless Steel Gauge: 16G (1.2mm) Size: 5/16" (8mm) Highest Quality 316L Surgical Stainless Steel. Press Fit Stone Set Ball Over 316L Surgical Steel Labret/Monroe Color: Rainbow