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 storage, suitable for teachers and students, it is a good gift set for mathematics, geometry, art, drafting and drawing Set of 8 geometric compasses: includes 1x compass school, 1x pencil lead refills, 2x triangle rulers, 1x protractor, 1x straight ruler, 1x mechanical pencil and 1x eraser. Apply to: 8 piece geometry set suitable for teachers, students, woker, can help students solve all basic geometric compass set projects.