18G has a 2.5mm disk, 16G has a 3-4mm disk, 14G has a 4mm disk
If you are unsure of the size you need we recommend seeing your local piercer. If you need help locating a piercer near you please fill out our contact form and we are happy to help you. (:
Threadless ends have a small bend in the pin to create tension when pushed into the labret post. The tops push straight on and to take off they pull apart.