Esterbrook Niblet

The standard nib sizes available for the Niblet are extra-fine, fine, medium, broad, a 1.1mm stub, extra-fine flex, and fine flex. Specialty grinds are also available, such as Double Broad, Techo, Architect, and Fude. That range is unusually wide for a pocket pen and is part of what makes the Niblet special.

To choose the right nib size, consider the width of your handwriting and the quality of the paper you write on most. A fine or extra-fine nib suits small handwriting and everyday notes. If you move up to a medium nib, be sure to write on high-quality paper that’s equipped to support the wider, wetter ink flow of a thicker nib. A broad or the 1.1mm stub delivers more ink and line variation for signatures and journaling. The flex and specialty grinds are for writers who already know they love that nib’s specific character.

Nearly all the nibs in the Esterbrook lineup are interchangeable with the Niblet because they share the screw-in #6 JoWo nib unit. This means that if you already own an Estie, you can move a nib you love straight onto the Niblet. One exception worth mentioning: the piston-filling Estie uses a different housing unit, so isn’t compatible with the Niblet’s nib unit.

Yes, it is comfortable to write with, though there's a trick to it. Uncapped, it's short, so most writers post the cap on the back. With the cap securely screw-posted, the Niblet stretches out to roughly the length of a Kaweco Sport. From there it writes like a full-size pen. Your fingers land on a proper grip section instead of a pinched little nose cone, the #6 nib gives you a broad, planted sweet spot, and the balance sits right where your hand wants it. It's the rare pocket pen you can fill a page with and forget you're holding, then cap and drop back in a pocket.

The Niblet pen takes standard short international cartridges and ships with one black cartridge and one custom mini converter. The mini converter holds less ink than a full-size converter, so plan to refill it more often if you write a lot. To fill the mini converter, push the converter into the back of the grip section, submerge the nib fully in your bottled ink, and twist the knob to draw ink up.

The Niblet and the Esterbrook Estie differ mainly in size. The Niblet is the pocket-sized version, while the Estie is the full-size flagship you can write with unposted. Choose the Niblet if you want a pen you can carry all day without it being noticeable, and size up to the Estie if you want a larger pen to keep at your desk.

They land in the same pocket, but they get there differently. The Niblet runs a full-size #6 JoWo nib that screws out as a unit, so you can move a grind across your Esterbrooks. The Sport wears a smaller, friction-fit nib that stays in the Kaweco world, so it won't cross over to the Niblet's screw-in #6. Posted, the two are about the same length, which is why they both live in the pocket fountain pen category. Reach for the Niblet if you want the bigger nib and the freedom to move it between pens. Reach for the Sport if you want something lighter, more angular, and easier on the wallet as a first fountain pen.

The Esterbrook Niblet fountain pen is best for anyone who wants a serious fountain pen that doesn’t require a dedicated briefcase to haul around. The Niblet is built for daily carry. It slips effortlessly into a pocket, planner loop, or bag, ready the second you pop the cap. It’s also an absolute home run gift for Esterbrook loyalists who love mixing and matching their nibs.