I don't know what 0-16g means, because it appears that all of the sizes (of the plugs AND the bars) are the same and the bars are a bit thick (16g I'm guessing). So if you're used to wearing regular earrings, just beware that the bars may not slide in like you're used to. I popped them through my holes, but it hurt and took a mild dose of bravery. They look good though and would probably pass for plugs if that's what I was going for. All in all though, I really like them.