20 Pack Plastic Protractor, 180 Degrees Protractor for Angle Measurement Student Math, 4 Inches ar

20 Pack protractors: the material is plastic; The bottom side length is 10 cm, 4 inch size make it easy to put on your books, notebooks and pencil case Measure protractor with accurate number: the black numbers are clear and easy to identify, then you can read quickly with great accuracy Half round shape: the plastic protractors are the common shape protractor, it's universal, you can applied to settle the math problems frequently Thick and durable protractors: this clear plastic protractor is thick enough, thus they are not easy to snap; Total: 20 pieces Measure math tool: the geometry protractors are suitable for painting, measure, homework, technical drawing; Abundant bulk, you can send them to your friends and classmates