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Jewelry
Why Internally threaded jewelry? Safety and quality are the reasons that Fatty's uses internally threaded jewelry. Threads are present on all body jewelry that has a removable end piece that screws off. The threads look much like the threads on a screw. With internally threaded jewelry, the threads are on the removable end piece. The barbell shaft is smooth which passes through the pierced area easily. With externally threaded jewelry, the threads are on the barbell shaft which means that the threaded end passes through the piercing ever time the jewelry is inserted or removed. This is undesirable for two reasons. The threads not only can cause irritation to the piercing, but the threads provide nooks for bacteria to reside in which comes into contact with raw flesh enhancing the risk of infection. You will notice when comparing jewelry prices that internally threaded jewelry costs more than externally threaded jewelry. This is due to the fact that it's more difficult and costly to manufacture. ASTM is the Association for the Standardizing and Testing of Materials. Our manufacturers are more than willing to provide a materials certification including the ASTM numbers assigned to each of the corresponding metals: Medical implant grade steel (316lvm): ASTM F138
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