I hand form these out of 18 gauge (1.02mm) in pure niobium and pure titanium and smooth the tips. These are brilliant for highly sensitive and newer piercings. Oval hoops sit closer to the nostril. The inner diameter is measured at the longest point of the hoop, top to bottom and they are ordered in the same size as a well-fitted round hoop. Kristina is wearing an 18g 7mm sterling silver. Shots show 18g titanium in 6mm, 7mm and 8mm id. The final shot shows the 28g 14k white, 26g 14k yellow, 24g 14k pink, 22g niobium and 20g sterling silver so that you can compare colors and thickness. This listing is for one (1) hoop. Choose your metal, finish and size from the drop down menus. Please check below for sizing details and materials information. Please allow for slight variations due to the handmade nature of the hoops.