Twist and roll this UltraFlex™ 12" / 30 cm ruler to measure curved and angular surfaces accurately. SAFE-T® Plastic will not break or shatter under normal classroom conditions. Features both U.S. customary and metric scales. Transparency lets students see what they´re measuring. Ruler regains its flat shape when not in use. Colors vary. 1 ruler each, bundle of 12, 12 rulers total