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Replacement brass tube for the Zen and Zap Cap Pen Kits
Brass Tube - Zen & Zap Cap Pen Kits
Replacement brass tubes for single barrel pen kits - The Zen and Zap Cap pen kits.
Sold per each.
Here you go - https://www.exoticblanks.com/brass-tube-zen.html 0.400 x 3.35