Description: LARGE RULE: Great size ruler for geometry drawing and math lessons, suitable for classroom, school or office. EASY TO USE: Light in weight, the teaching ruler is easy to hold, perfect drawing aids for teachers. LARGE NUMBERS: Design measurements with clear, large numbers; easy to read for chalkboards, whiteboards, erase boards, and more. High quality: PP material, wear resistant, not easy to deform, and will not scratch your hands. WIDE APPLICATION: The Mathematical Geometry Toolkit is an essential tool for architects, engineers, artists, designers, teachers and more. Specification: Material: PP Size Chart: 90 Degree Ruler: 57cmx33cm/22.44inchx12.99inch degree Ruler: 56x40cm/22.05x15.75inch Protractor: 50cm/19.69inch : 43x41cm/16.93x16.14inch Package Includes: 4 Rulers Note: Please allow slightly errors due to manual measurement and different monitors. Blackboard Chalkboard White Black Board Math Digital Angle Straight Triangle Rulers Learning Classroom Student School Office Home Supplies