This is a high quality labret monroe lip jewelry made from solid high polish TITANIUM 6ALV-ELI (Grade 23) IMPLANT GRADE with a 4mm round bead. The comfortable flat end measures 4mm.The size is 16 gauge and your choice of 8mm-5/16, 10mm-3/8, or 12mm-1/2 of an inch. The entire piece is nickel free.