Descriptions:1. The plastic rulers are made of safer, flexible, and shatter-resistant plastic for using a long time.2. A good measuring tool, easy and convenient to use.3. Transparent color allows for a clear view of numbers on the page to read easily. With the clear math ruler, you can measure an object easily4. The ruler is suitable for a variety of applications in classrooms, offices, and homes, for artists, designers, architects, engineers and so on.