Parker Compatible Mini Ballpoint Pen Refill - D1 Mini Pocket Pen Refills | eBay
Amazon.com : Schmidt 635 Mini D1 Ballpoint Refill Medium, 4 Pack, Blue (SC58150) : Office Products
Amazon.com : Parker D1 Mini Multi-Functional Pen Refills, Blue Ink, Medium Point, 5/Pack : Fine Writing Instruments : Office Products
D1 Mini Ballpoint Refill
Amazon.com : Jaymo Replacement for Cross 8518 and Schmidt 635 - Measures 2.625 in / 67 mm Long - D (D1) Standard Multifunction Mini Ballpoint Pen Refill - 6 Black + 6 Blue : Office Products