These rotatable ruler resist breakage, great for everyday use by students Size: about 12cm / 4.72in, eaasy to carry The rulers feature rotatable protractors and removable straightedges, while the square ruler boasts a rotatable center, enhancing flexibility and usability These multifunctional geometric ruler simplify complex tasks with their designs These rulers are perfect for students, architects, artists and so on, Manufacturer: Limtula