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