These are the Japanese equivalent of the Gelly Roll Moonlight pen, with the same patented gel ink that is perfect for writing on both light & dark coloured papers (these look great in Archer & Olive Blackout books!).
The creamy, smooth, opaque ink works like a paint pen so is great for lettering, doodling and pattern drawing in your planner or journal. All colours are bright on white paper and produce outstanding effects on quality black paper. The fluorescents even glow under a black light source, popping the colours right off the paper.