GP22 Black/ Blue Refill German Formula Ink Refill Pack is designed for one of the most funded Kickstarter pen projects, GP 1945 Bolt Action Plus Pen Titanium/ Aluminum. Optimal performance with consistent ink flow for smooth writing for desktop, in-car or in-the-wild. Compact size for storage. 60mm in length, 6mm diameter, 2.5mm front tube, 1.0mm medium point. Compatible with many short & compact pens beside GP 1945 Bolt Action Pen by GPCA, Black/ Blue Color Gel Ink with a durable cartridge.
Please note air bubble could form during the shipping, putting the refill upright for a few days can eliminate the air bubble and help smooth writing.