Double-side ruler: the ruler's one side is metric scale (30 cm), another side is inch scale (12 inches), both inches and centimeters for easy conversion. Double scale design: clear and accurate scale makes it very convenient to read the scale. High quality: wooden student ruler is made of hard wood material. Smooth surface and tough. Not easy to bend. Note: keep away from water and fire. Wide applications: wooden rulers are suitable for home, office using, especially for school students and teachers, also can be applied for experiments and crafts