With Sonic's Nobirura, you have two rulers in one: it is a 16 cm (6.3 inches) ruler that extends to become a 30 cm (11.8 inches) ruler. In its compact 16 cm form, the ruler conveniently fits in your pencil case. The clip lets you clip it to your notebook and papers, and it serves as a handy bookmark. Once extended to its long form, the ruler is long enough to draw straight vertical lines down an A4-size page. Extending the ruler is easy and smooth—simply grip the clip and slide it out until it snaps into place. The name "Nobirura" conveys this unique feature, by incorporating "nobiru," the Japanese word for "extends". The ruler is not only functional, but is aesthetically attractive, made of transparent acrylic and coordinating plastic.
I love this ruler. It always annoyed me that I couldn't take a ruler to school
because it was too long. This solved my problems. It fits in my pencil case with
room to spare. I can use it for my small graphs in math, or on the poster I am
working on for english. This ruler is great and durable. FYI... when I say
durable, I do not mean that I have thrown it everywhere and messed with it a
bunch, just that it hold up well when you treat it right.