This ruler is made of a unique material that is durable enough for even the messiest classrooms, but is still light and flexible enough for even the youngest students to use. Transparent colors make it easy to see what you are measuring. Features both Standard and Metric graduations and a convenient hang hole for storage. Ruler is unbreakable under normal conditions and use. Ruler Type: Standard; Metric; Length: 12.72"; Standard Scale: 1/16"; Metric Scale: 1 mm.