It's Academic puts a fun twist on ordinary classroom products. Why stick with a regular, wooden or standard ruler when you can have fun with numbers by using the cute and colorful Flexi Ruler! The fun doesn’t stop there — these plastic, flexible rulers are best to use for both 12 inches and 30 cms with easy-to-read and accurate measurements. With kid-friendly colors from blue to red and green to purple, you can't go mathematically wrong with this ruler!