Key Features :
i : DESIGNED FOR THE CLASSROOM -- This large magnetic protractor is perfect for demonstration on a whiteboard. It's marked up to 30cm and 10 inches.ii : TEACH STEM -- This jumbo tool ensures easy demonstration of math, engineering and geometry concepts. Use it to teach measurements, angles and shapes.iii : PRECISE DRAWING TOOL -- Protractors are perfect for art, which requires exact shapes. This handy, magnetic geometry tool is perfect for creative classrooms.iv : COMPLETE YOUR GEOMETRY TOOLBOX -- Pair this protractor with other Learning Advantage Dry Erase Measurement Tools: Straight Edge (sold separately) and Triangles (sold separately).v : BUILT TO LAST -- The protractor is made from durable plastic which allows it to handle numerous drops and years of use in the class setting.vi : EASY TO CONTROL -- Grasp this oversized tool with ease! The included magnets ensure stability while drawing, and the ergonomic handle ensures greater control during use.