This nice little labret is hand casted in sterling silver by Uppsala Fingjuteri after an original made my be.
When I get it back from the caster I clean it up and add a little piece of thread that goes in the bioflex post. Finally I give it it's finish, either black (oxidized) gray (oxidized then brushed) or silver (lightly brushed)
The bioflex post comes in 18g (1mm, only 6mm and 7mm length) 16g (1.2mm) or 14g (1.6mm) and in a number of different lengths.
The 2nd and 3rd picture shows the jewelry piece with a 6mm 16g bioflex post.