Measure math tool: the geometry protractors are suitable for painting, measure, homework, technical drawing; You can send them to your friends and classmates 50 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 Sturdy protractors: this clear plastic protractor is thick enough, thus they are not easy to snap; Abundant bulk, total: 50 pieces Black accurate number: the black numbers are clear and easy to identify, then you can read quickly with great accuracy Common protractor: the plastic protractors are the common shape protractor, it's universal, you can applied to settle the math problems frequently, Weight: 0.66 pounds, Manufacturer: eBoot