ITEM - Internally Threaded Flat Opal Top with Flat Back Post. Use in Lip, Medusa, Tragus, Conch, Cartilage, Helix, Ears, Labret, etc..MATERIAL - ASTM-F136 Titanium, Cabochon OpalGUAGE/THICKNESS - 18g, 16g , 14gSIZE - Top is 4mm. Post comes in 6, 8 10mmTHREAD - Internally ThreadedSold in SinglesWe take hygiene serious, please note we can not accept return on body jewelry