Description: 【Math Teacher Aids】: Large Straight Ruler for geometry drawing and math lessons, suitable for classroom, school, or office 【Clear Scale】: Math geometry ruler has a clear scale, easy to measure and read, suitable for chalkboards, whiteboards, erase boards, and more 【Easy to Use】: Teaching ruler is designed with a removable handle, lightweight, and easy to hold, making it an great drawing aid for instructor 【Material】: Drawing math geometry tool is made of premium PP material with high flexibility, sturdy and wear resistant, not easy to deform, smooth surface, will not scratch your hand 【Widely Used】: Math geometry teaching ruler is an essential tool for architects, engineers, artists, designers, instructor, etc Size Chart: 50cmx5.5cm/19.69inchx2.17inch Package Includes: 1 Math Geometry Straight Ruler Note: Please allow slightly errors due to manual measurement and different monitors.