Quantity --The set includes 4pcs measuring rulers, 1pc 15cm ruler, 1pc 180 protractor, 1pc 45 triangle and 1pc 60 triangle.< br >Advantages -- The scale line is engraved by laser, the scale is accurate, the writing is clear, and the paint will not drop after a long time.< br >Design -- The ruler has rounded corners and does not hurt your hands. Hollow design, easy to use. A ruler storage box is included for easy storage and keep the desk tidy.< br >Material -- The geometric ruler set is made of aluminum alloy, light in weight, thickened material, not easy to break. Longer life than plastic rulers.< br >Application -- The mathematical geometry tool set is a useful tool for architects, engineers, artists, designers, students, teachers, etc.; suitable for school students.