Titanium 16g flat-back threadless "snap-together" post. Great for lip, earlobe, and ear cartilage piercings, or slightly thicker nostrils.
Sizing Guidelines: Nostril/ear
Sizing Guidelines: Lip
Remember that these are just guidelines, and that it's generally safer to go longer than you think you need than shorter. Lips are much trickier than ears or noses, as there is much more variety in sizing. Also lip piercings can experience much more swelling during healing, due to irritation from things like toothpaste, cigarettes (or any other smoking), and spicy food.
You need to purchase some kind of end with these posts - gemstone, ball, spike - this is just the post. These posts only work with ends designed for 16 straight posts.