These rulers are made from safe environmentally PVC, flexible & durable. Shatter-resistant so you can bend it easily. These flexible rulers do not have sharp metal edges like traditional rulers have.A great choice to share with teachers and students as a gift, easy to read the scale clearly, and can be accurately measured, won't easily fade, keep the colors and looks for a long time.Great for schoolwork or activities that require straight lines, and artists, designers, architects, engineers, students; Suitable for classroom, school, office, home and more usages.