I have more sizes available available in the studio so if you see the size you need not listed please reach out. 
All will have a 4mm back on them as I find these the most universal. If your purchasing for a large heavy piece or a very small peace you will need to choose a back size accordingly. Please reach out and I’m always happy to advise on sizing. 
I would always recommend having high end jewellery fitted by a professional piercer to ensure the correct fit and size.  If your local to
Sheffield you’re always welcome to visit me. 
Junipurr titanium threadless and internally threaded labret posts are made with verified implant-grade ASTM F-136 Titanium (6AL-4V-ELI) that is APP Approved.  These labret posts are designed for use with Junipurr Jewelry but fit most APP approved threadless ends.