These rulers are made with premium plastic material, so that it . Good material can ensure its durability and practicability. It is perfect for office or school use. A great present choice for your kids. Features - Color: Assorted Color. - Material: Plastic. - Size: 31.50X3.50X0.30cm/12.38X1.38X0.12inch. - Dual side measuring ruler, centimeter scale is on one edges of the ruler and inch scale is on the other edges, which can meet your different measuring needs. - The straight ruler is made of plastic material, and sturdy. - A good measuring tool for your kids to use at school or home, easy and convenient to use. - Precise measuring tool for students, artists, teachers, engineers, and more. Quality-made to ensure accuracy when measuring or creating lines. - Encouraged hands-on learning and discovery, driving deeper understanding and helping students unlock their full potential. Package list: 16 x rulers