Easy to identify scale: Unique rotating device and transparent design, you can easily take measurements and display 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 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm , 11 mm, 12.5 mm, 15 mm, these circular patterns with different radii meet your different requirements. Simply draw a circle. in ten seconds. 4 random colors: the protractor is made of high-quality thick plastic, which is not easy to break. 11.5 cm / 360 degrees, round shape, plastic protractor is universal round. There are 4 random colors: blue, red, green and yellow. Easy to carry: easy to carry: you can store the tool in a backpack or in a place on the table, easy to carry and store. Facilitate the use of teachers and students. At the same time, it is compatible with compass, ruler, etc. Essential measuring instruments for students: the protractor with a smooth surface can move easily on paper. The are necessary measuring instruments when students have math lessons or do homework. Bright colors cannot be ignored and it is easy to find them quickly on a messy desktop. These protractors can be used for home and office, school students and teachers, suitable for painting, fairs, homework, technical drawing.