Great for children, student to use at home or school, and office staff. There are 2 different types, & black & colorful apperance. Such ruler is made aluminum alloy of materials in which makes itself getting great popularity. Draw many patterns of square, star, for round, for heart-shaped, building up an interesting painting, improving children's imagination. foldable ruler with locking button, it's lovely, and easy to carry., Manufacturer: JSGHGDF