【Math Teacher Aids】: Large size ruler for geometry drawing and math lessons, suitable for classroom, school or office. 【Large Numbers】: Math geometry ruler has clear large numbers on it, easy for you to measure and read, suitable for chalkboards, whiteboards, erase boards and more. 【Easy to Use】: Teaching ruler is lightweight and easy to hold, ideal drawing aid for teachers. 【Material】: Drawing math geometry tool is made of durable material, strong and durable, wear resistant, not easy to deform, won't scratch your hand. 【Widely Used】: Math geometry teaching supplies are essential tools for architects, engineers, artists, designers, teachers and more. Size Chart: 45 Triangle: 36.5cmx51cm/14.37inchx20.08inch 60 Degree Triangle: 29.5cmx51cmx58.5cm/11.61inchx20.08inchx23.03inch Protractor: 45.5cmx25cm/17.91inchx9.84inch Compass: 43cm/16.93inch Straight Ruler: 51cm/20.08inch Package Includes:1x 45 Triangle, 1x 60 Degree Triangle, 1x Protractor, 1x Compass, 1x Straight Ruler, 1x Storage Bag Note: Please allow slightly errors due to manual measurement and different monitors.