Tom's Studio Lumos Pro Duo Pen is an infinitely refillable fineliner, writing & brush pen that includes 11 interchangeable Japanese-made artist's tips. The Duo Lumos has two different pens in one body, allowing you to easily change between nibs and ink colors on either side. This pen is compatible with dye-based fountain pen inks, so long as they don’t contain particles (such as shimmer inks) or binders (like acrylic or shellac).
Comes with 11 professional artist's tips (Fineliner: 0.1, 0.2, 0.3, 0.5, 0.8, 1.0, Felt-Tip, Chisel, bullet & brush, Writing: 0.3, 0.5,) .3ml deep black ink sample, and 2 ink reservoirs.
Pen measures 6" capped and 5.7" uncapped.
The Lumos replacement tip set available here & spare reservoirs here.