The listing, Metal Tunnels has ended.
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I'm unsure of the gauge of these. They are a few years old.
They come with ONE O-ring.
I measured using MM
They are about 11MM
11.1MM equals to 7/16
So I'm ASSUMING they are 7/16, but could still be wrong.
Previously worn and cleaned.
I do not do tracking. If you'd like tracking, you can pay for it through payapl ($1.00). I keep all my receipts to show proof that I sent it.
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Feel free to ask any and all questions :)
*(gauge), plugs, tunnel*