https://www.amazon.com/Pierced-Owl-Titanium-Internally-Threaded/dp/B01NAYQY6P/ref=sr_1_9?dchild=1&keywords=surgical+titanium+nipple+rings+internally&qid=1615907571&sr=8-9
https://www.amazon.com/Pierced-Owl-Titanium-Internally-Threaded/dp/B08FF76Q6R/ref=sr_1_2?dchild=1&keywords=surgical+titanium+nipple+rings+internally&qid=1615907571&sr=8-2
Are either of these suitable? One says 'implant grade' but the other is internally threaded