Magic Ruler / Stationery

Some time, we want our rulers to be short for portable. But, we need longer rulers when we are trying to draw a large picture. Magic Ruler is design to solve this problem. Each ruler is designed as a part of puzzles, which can be joint together to be a longer ruler easily when we need a long ruler. What is more, we can take up Magic Ruler more convenient because of the special design to the ruler。