Safe-T-Ruler, Ultra Flex View-Thru, Dual Scale, Bendable Ruler, 12"/ 30cm. Twist and roll this UltraFlex 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 scale, measures 1-1/2" / 38mm wide. Transparency lets students see what they're measuring. Ruler regains its flat shape when not in use. Assorted olors. Sold individually.