Snap in ones for captive rings, or screw-in ones for certain sizes? Because captive ring ones are fine. But if it's for a specific gauge, I'll need to know. I have 16g lip piercings and my girlfriend has a 14g eyebrow, bellybutton, and tragus ring. So it'd be nice to get replacements (I lost so many of mine) for screw on balls. I don't have any captive rings yet.