These wooden rulers have a straight metal edge that makes it easier to draw straight lines and take accurate measurements. Each ruler has both imperial and metric measurements. Dual scaled with 1/16” divisions on one side and centimeter and millimeter on the other. Made of a durable, hard wood that is made to last. These rulers are also smooth surface safe for students. These versatile rulers are perfect for a wide variety of uses in the classroom, at home, or in the office! Ideal for students, engineers, architects, designers, artists, and more! This set includes 12 Wooden 12” (30 cm) Rulers with a metal edge. For over 50 years, hand2mind has encouraged hands-on learning and discovery, driving deeper understanding and helping children unlock their full potential. hand2mind specializes in math manipulatives designed to help students learn by doing. Particularly with learning shapes, hand2mind has you set with geometry sets, compasses for geometry, protractors, rulers and all necessary school supplies. From early math to middle school math, hand2mind has you covered with products designed to enhance learning in the classroom and the world around us. Through hands-on exploration and discovery, we strive to find new ways to encourage students in math practice, literacy activities, STEM education and more!