The premier clear ruler is perfect for school, office and home to rule those straight lines. It is made of high-quality plastic which makes it durable, strong and a great measuring tool. This ruler features inches on one side, centimeters and millimeters on the other. It is absolutely crystal clear which makes it easy to see your work underneath. It has clear and accurate scale so that you can measure your items accurately. This 30cm ruler is a useful measuring tool for artists, designers, architects, engineers, students and so on; suitable for classroom, school, office, home, etc.