The Pilot Kakuno Fountain Pen was designed with novice and experienced fountain pen users in mind. The Kakuno features a fun smiley face on the finely crafted nib to ensure the perfect writing position. One cartridge of black Ink is included with the pen. Pilot Kakunos only use Pilot Brand cartridges. A simple guide to fountain pen point sizes: Extra Fine is for tiny writers and people who want to write a line thickness similar to their gel pens. A favorite to use in Japanese planners. Fine is most people's favorite. It is a good middle ground between very fine writing, without being too scratchy. Medium is great for beginners because it will be very smooth to write with and will be easier to write with! Larger nib sizes have a wider angle of acceptable writing positions.