Material: These rulers are made of soft plastic. Material safety and environmental protection. The ruler can be folded and placed in your pencil box or on your desk to save space. Multiple purposes: These flexible rulers can be used not only to measure linear distance, but also to measure circular arcs such as cylinders, which will meet your measurement needs. Durable: These rulers are soft due to their good quality. They are not as easily broken as other ordinary plastic rulers, so they can be used for a long time. Multiple applications: There are scales on both sides of the ruler, which are respectively centimeter scale and inch scale. The surface of each ruler has four wavy circular hollow , which can meet your multiple use needs to the maximum. Package includes: four rulers in different colors. Each ruler is 30 cm/11.76 inch long, and the effective scale is 30 cm/12 inch. You can choose the color you like according to your own preferences, or you can give it to your classmates, colleagues or friends. size: 30cm Material: Plastic colour: Red, yellow, blue, green Package Contents: 4 x flexible ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.