The diameter of these rings is a lot bigger than I though they would be but it says right there 10mm so I'm just stupid. It took some getting used to as I use these as septum rings and my face is a bit smaller. The balls are really big too but overall I like having a septum ring to match anything. The yellow is kind of a gross urine color. I don't think I'll ever use it unless I am having an emergency and need a spare. They are fine products, I haven't had any issues with balls unscrewing.