These cute rulers are a must have for every person trying to learn Japanese! They are super handy, as they both display cm and inches. These have a katakana chart at the front and a hiragana chart at the back! Super handy when you've forgotten a character, just quickly look up what it was and continue your writing. These measure a compact 15 cm (6 inches) and they fit nicely in your pencil case or between your other stationary.