Amazon.com : CJMILADO Ballpoint Pen Metal Mini Refill D1/635 Refill- Medium Point Refill for Multifunction Pen,Mini Pen Compact Pen(Blue ink 8 pack) : Office Products
Ballpoint Pen Mini Refill– Topdrawer
Levenger Mini Pen Refills (set of 5)
Amazon.com: Parker D1 Mini Multi-Functional Pen Refills, Blue Ink, Medium Point, 5/Pack