Ruler with 2 scales: One side is metric scale(30cm and 15cm), opposite side is inch scale(12 inches and 6 inches, both inches and centimeters for conversion. The scale of the ruler is very clear and accurate, will be helpful you in measuring your items accurately. Wooden ruler - our 6 pack 12 inch and 6 pack 6 inch ruler is 100% made of high-quality natural wood, BPA free .The edges are smooth and free of burrs, don't worry about hurting your hands. Wide application, perfect for office, school, home using. Especially for school student and teachers.