LIP RING SIZING INFORMATION: 16 gauge, 5/16 inch (8mm) length is the most common size for lip rings after the piercing has fully healed. Initial lip piercings are usually done with a labret stud or captive ring that is 16 gauge and 3/8 inch or longer to compensate for swelling after piercing. When the lip piercing heals, most people can use a 5/16 Inch (8mm) length, or even a very short 1/4 inch (6mm) but not everyone! Again, this is a guideline. If your lip is thicker, you may need a longer length lip ring. Some piercers are also using 18 gauge for lip piercings, which is slightly thinner.