GP22 Black/ Blue Refill German Formula Ink Refill Pack is designed for one of the most funded Kickstarter pen projects, GP 1945 Bolt Action Pen Titanium/ Aluminum. Optimal performance with consistent ink flow for smooth writing on desktop, in-car, or in the wild. Compact size for storage. 60mm in length, 6mm diameter, 2.5mm front tube, 1.
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Practical product, a necessity if you have the pen and want to keep using it!