Internally Threaded body jewelry is a simple and sturdy way to keep jewelry securely in place. EBJ's high-quality internal threads are made of ( metal certified ) 316L Surgical Grade Steel Metal or Grade 23 Titanium and fasten tightly with at least three full turns. The jewelry is versatile, and can easily switch between different jewelry tops. EBJ offers a variety of internally threaded jewelry, including the Labret | Monroe and Dermal Anchors collection, Navel Ring, Curved Barbell, Horseshoe, and BioFlex Labret for metal-sensitive individuals.