tan-pen (GREEN)"tan pen" means "a short pen." It's very good with a planner. Easy to carry and fun to use! Let us know your favorite pen point in the note: Fine Medium Fine Medium. Beautiful color variations that are inspired by crayons. A small nib makes it easy to write tiny details, as well as Kanji having many strokes. The posted length is 131mm. It's small but comfortable. It can be used with a short cartridge of international standard type, not with a long