Double-Side Ruler: these wood rulers have 1/16 inch standard (12 inches totally) and 30 cm metric scales, both inches and centimeters for easy conversion. Material: Made of hard wood, smooth surface, no glitches, very tough and not easy to bend, easy to use and allows a long serve life. Accurate ruler: The scale of the ruler is very clear and accurate, which will help you accurately measure your items and architectural drawings. Quantity: 20 pieces of wood rulers in total, enough quantity can satisfy your use of various occasions. Wide applications: wooden rulers are suitable for office,home using, especially for school students and teachers, also can be applied for crafts and experiments. Are you still looking for a durable and practical ruler? Our wooden rulers are made of good-quality wood, which is smooth and not easy to bend or break. With fine workmanship and smooth surface, our wooden rulers are comfortable to grip, wear-resistant, and easy to clean. These wooden rulers have clear scale lines and markings, which are easy to read and measure. Equipped with 2 scales, our wooden rulers can meet your different measurement needs. With 20 pieces wooden rulers in this package, you can share them with your classmates or family, and you don't need to worry about running out of them in the classroom or office. These wooden rulers are suitable for many occasions, such as school, home,office, and laboratory.