Sturdy Box: A plastic box to protect and store all the tools. It can be placed on backpacks and tables for easy carrying and storage. Transparent ruler set:transparent color plastic ruler allows you to see the words, letters and numbers on the page through the protractor. Triangular (30/45/60) and 6 inch squares and rulers are easy to read, which is better visibility for students and adults. Strong and Reliable Compasses :The compasses in this kit are made from solid metal for good performance (they will not bend during use). In addition, the head of the compasses offers an ergonomic design for a comfortable grip even during prolonged use. Wide Application: This set is developed by experienced math professionals and is suitable at most levels of students, teachers, designers, artists, etc. To meet all your needs for drawing circles and measuring angles. A practical choice for teachers and students: It is also a perfect gift for your children and friends , easy to take to class and store in the classroom and at home.