Guide to D1 Refills | JetPens
Multi pens and mini pens are the curiosities of the pen world—how do you make a pen that holds five different inks inside, or a pen the size of a sticky note?
Many of these pens have the same secret: the D1 refill. This standard refill size is incredibly short and slim and is able to fit into a variety of small pens. Pens that use D1 refills are compatible with D1 refills from any brand, giving you a greater variety of colors and inks to choose from.
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