It's Awesome! I got the 7mm which is the perfect size for me (wanted it to fit snug). It was not too hard to close. It was a bit difficult to get in because I didn't want to bend it and the curvature makes it so you have to be careful with the angle you insert it at. But once I got it in it looked great! I am allergic to metals except gold and surgical steel and this did not cause any reactions with me.