Internally threaded body jewelry is popular with piercing shops and professional body piercers. Many customers often ask us about the difference between internally threaded jewelry and externally threaded jewelry. Internally threaded barbells contain the threading inside the removable part of the body jewelry - for example with internally threaded belly button rings the threading would be located inside the belly ring ball top rather than on the actual barbell. This means that an internally threaded barbell is more time consuming and thus more expensive to manufacturer. However, internally thread body jewelry is safer because you do not have any risk of the screw scratching or tearing your skin. You might also be interested in our Belly Rings for Sensitive Skin or a Captive Bead Ring.