The Field Mouse comes fitted with a Japanese-made writing tip that has a similar feel on the page to a rollerball or ballpoint. Because there is no ball that lays the ink on the page, it means that there is no 'blobbing' or line inconsistency. 

Unlike disposable pens, the Field Mouse is designed to be endlessly refillable, helping to reduce the staggering number of single-use pens that end up in landfill each year.

The Lumos is designed to be highly versatile – it can accommodate 11 different tips within the same pen, allowing it to function as a refillable fineliner, writing pen, and brush pen.

In contrast, the Wren is more of a dedicated pocket writing pen. It features a specialised writing tip, a quick pop-on and pop-off cap, and is designed to transition from a compact, travel-friendly size to a very comfortable length in the hand when capped.

The Field Mouse is a pen designed for travel – it’s much smaller (and will fit perfectly on your keys!) and designed for brief stints of writing, like jotting down to-dos in the moment, penning a last-minute birthday card or crossing off your shopping list in the store.

We have a range of Field Mice (a mischief of mice, if you will). Blush, Lilac and Sage feature machined anodised aluminium bodies, with solid brass lids. Anodising makes the pen durable, with a finish tough enough to stand the test of time and an array of stunning colour options.

We also have a solid brass and stainless steel option – slightly heavier in hand and both likely to develop a beautiful patina with use (unless you keep them polished!)

• Length capped – 63mm
• Length uncapped – 54mm
• Weight: Blush, Lilac, Sage – 12g / Brass – 23g / Stainless Steel – 21g

Yes, the Field Mouse is designed for travel. Its compact size, lightweight build and secure cap make it perfect for jotting down notes on the go.

The Field Mouse is also safe for aeroplane travel. None of its elements are considered liquid items, and it can be carried normally in your hand luggage. We do not recommend transporting it in your checked luggage.

Yes! The ink dries really quickly so there is no fear of smudging.

No they can’t, the Field Mouse reservoirs are shorter than the Wren ones. You can purchase additional Field Mouse reservoirs here.

We love our Fibre Tip Ink in Midnight for a smooth, consistent colour (and it’s the ink sample provided with your pen). The Field Mouse is also compatible with nearly all fountain pen inks, with the exception of highly experimental varieties like shimmer or iridescent inks.

Be aware that some fountain pen ink colours may appear lighter after initial use due to ink concentration in the tip.

It’s important to avoid using calligraphy inks with acrylic binders, as they can clog the pen.

To refill, simply unscrew the bottom of your Field Mouse. Nested in the base piece, you'll find a reservoir. Dip it in ink and let capillary action draw the ink into the pen. Replace in the pen and wait a moment for the ink to fill the tip.

To change ink colours, rinse the nib and reservoir under warm water, dry thoroughly, and refill with your new ink. Alternatively, you can swap out the reservoir and tip entirely, storing the removed components in a handy container to prevent drying.

If you consistently use the same ink and take proper care of it, the reservoir can last indefinitely.

However, if you frequently change inks and wash out the reservoir each time, the capillary action might be affected, limiting its lifespan to about 4-5 washes.

We offer reservoir containers that make it easy to switch between different ink colours while maintaining their condition. Once a reservoir is fully used, we do sell spares.

The Field Mouse features a Japanese-made writing tip (the same as the one in the Wren). You can find replacement tips specifically for the Field Mouse here.

Please note that Lumos tips are not compatible with the Field Mouse.

Yes, they use the same tip!

You can expect the high-quality, Japanese-made tip to last for months of regular use. The lifespan of a tip varies depending on factors such as writing style, pressure applied, paper type, and ink choice. When the tip eventually wears down, you can easily replace it with our handy packs of three replacement tips, available here. 

To clean the reservoir and pen body, soak them in warm soapy water and flush under the tap. For the tips, soak in nib cleaning solution or warm soapy water, then rinse thoroughly. A bit of ink may remain, but it will blend out after a few doodles with new ink. Let everything dry naturally for 48 hours before reassembling to avoid water damage.

Store your spare reservoirs and tips in our handy containers (or a ziplock bag) to prevent them from drying out, keeping them ready for future use.

Not a problem – just remove the tip from the end of the pen and the reservoir should drop out (just watch out for inky fingers!)