This is a grassy solid green TITANIUM 6ALV-ELI (Grade 23) IMPLANT GRADE lip ring with a step cone bead. The comfortable flat end measures 4mm. The size is available in 14 gauge or 16 gauge and your choice of 6mm-1/4, 8mm-5/16, 10mm-3/8, or 12mm-1/2 of an inch. Note: Size 6mm - 1/4 inch only comes in 16 Gauge. The entire piece is nickel free.