Material: Folding helix rulers are made of high-quality plastic, durable, shatterproof, lightweight, can be folded and placed in your pencil case or bags to save space. Size: Transparent ruler are 30 cm/12 inch total length, after folding up is 15 cm/6 inch, long enough to measure your daily objects, portable size is very convient to carry and stored in pencil case or bag. Feature: Folding rulers are designed with clear centimeters scale is easy to measure and convient to read the scale. The junction is a protractor that can be measured to 180. Function: Foldable ruler will meet your diverse measurement needs, which can be used for measuring straight-line distances and angles, there is a small hole on each scale for easy marking. Wide Use: Clear ruler can meet daily usages of children or adults at working and studying, such as draw line or flexibly measure most things, perfect for school, home, library, study room, office.