We are so excited about these hoops!!! After having worked on the design for these for nearly a year, we have perfected every single detail: the spacing of the checkers, the colors, the curve, the weight, and the feel. What sets these apart? They are made from implant grade titanium, one of THE safest metals for the human body. Bonus: titanium is very light weight and these almost feel like you're wearing nothing at all! Details: Sold as a pair. Interior diameter approx. 10mmMaterials: implant grade titanium, enamel, gold option is 18K gold PVD plated Care: These are tarnish-proof and waterproof. Rinse with clean water and dry if they come in contact with chlorinated water or salty water.Please be aware that with clicker style hoops such as this, sometimes the post that goes through the ear can get bumped slightly, reducing the secure click to close them. Please verify how these earrings will fit prior to wearing them and make sure to adjust the ear post slightly by pushing up or down on it, as needed until you hear a click (meaning that your earrings will stay shut!)