Material: This plastic ruler set is made of high quality, non-toxic and tasteless BPA-free plastic material. Scale Double-sided scale: This scale has inch and centimeter calibration, with centimeter scales on one side and inch scales on the other. Whether drawing or measuring, it is flexible in most cases. A fixed end allows you to easily draw straight horizontal lines. Easy to calibrate: This ruler set is made of transparent plastic, you can see the underlined notes, which is convenient for you to draw and check the measured length. The top of the ruler has a high quality plastic T-head for easy calibration. A handy hanging hole: The tail of this T-ruler has a hole for easy hanging, you can find a hook or nail directly after use. It does not occupy space and is easy to use due to its obvious location. The material is lightweight and does not add extra weight to your hook. Handy Tools: The transparent ruler with a black mark is suitable for engineers, architects, students, designers, artists, etc. It will be a good helper for your work and study. Delivery quantity: three pieces Note: The data is manual measurement, please allow 1 error -3cm, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.