Material: The ruler is made of high quality plastic, durable, not easy to wear and break, high definition and precise centimeter (angle) unit to ensure the accuracy of the data. Safe compass: This compass is easy to use; sturdy and durable, maximum diameter up to 25cm, with pointed protective sleeve, safe for children. Easy to carry: all geometry tools are packed in a transparent box, easy to carry and store, suitable for teachers and students, it is a good gift set for mathematics, geometry, art, writing and drawing Apply to: 8-piece geometry set suitable to teachers, students, woker, can help students solve all the basic projects of the geometric compass set. Set of 8 geometric compasses: includes 1x school compass, 1x pencil lead refills , 2x triangular rulers, 1x protractor, 1x straight ruler, 1x mechanical pencil and 1x eraser.