Easily Identifiable Scale: Unique rotating device and transparent design makes it easier for you to take measurements and view the numbers on the side with a protractor. The black scale is easy to read, so you can see the scale quickly and accurately. Circles with multiple radii With 16 small circles Can draw 1mm 1.5mm 2mm 2.5mm 3mm 3.5mm 4mm 5mm 6mm 7mm 8mm 9mm 10mm 11mm 12.5mm 15mm , These circular patterns with different radii meet your different needs, just draw a circle and get it in ten seconds. 4 random colors The protractor is made of high quality thick plastic that is not easy to break. 11.5 cm / 360 degrees, round shape; plastic protractor is universally round. There are 4 random colors: blue, red, green and yellow. Easy to Carry: Easy to Carry: You can put the tool in a backpack or in a place on the table for easy portability and storage. Facilitating the commitment of teachers and students. At the same time, it is compatible with compass, ruler, etc. Essential Measuring Tools for Students The protractor with a smooth surface can move easily on paper, necessary measuring tools when students have math class or homework, bright colors cannot be ignored and it is easy to quickly put them on a messy one These protractors can be used for home and office, school students and teachers, suitable for painting, measuring, homework, engineering drawing.