Retro Pen Kit Replacement Tubes 5 -Pair
Retro Pen Kit Replacement Tubes 5 PairRetro Pen Replacement Tubes
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Not quite 9mm
The guide chart lists the tubing as being 9mm whereas it is closer to being 11/32". the difference is 0.010". If the difference is okay with you, enjoy. For me the difference was too great for the intended project.