1. The straight rulers is made of acrylic material, thick, hard with a smooth surface for using a long time, a good measuring tool.2. Transparent color allows for a clear view of numbers and letters on the page. With the clear math ruler, you can measure an object easily.3. The measuring ruler kits can use them to measure, and draw geometric figures, etc., providing you with large convenience, suitable for a variety of applications in classrooms, offices, and homes, for artists, designers, architects, engineers and so on.
