Double-Sided Scale: This scale features inch and centimeter calibration with centimeter graduations on one side and inch graduations on the other. Whether drawing or measuring, it is flexible in most cases. With a fixed end, you can easily draw straight horizontal lines. Plastic Ruler: This plastic ruler set is made of high-quality BPA-free plastic, it is non-toxic and tasteless. It is reusable and guarantees a long service life. The measuring range of the ruler is 30 cm, the width of the ruler is 3 cm, and the thickness is 0.2 cm. The size is 31 x 3 x 0.2 cm. Easy to Calibrate: This ruler is made of transparent plastic. You can see the underlined notes that allow you to easily draw and check the measured length. The top of the ruler features a high-quality T-shaped plastic head for easy calibration. Convenient Hanging Hole: The tail of this T-shaped ruler features a hole for easy hanging. You can find a hook or nail right after use. It doesn't take up space and is easy to use due to its obvious position. The material is lightweight and won't add extra weight to your hook. Practical Tools: The transparent ruler with black marking is suitable for engineers, architects, students, draftsmen, artists, etc. It is a good helper for your work and study. With a durable ruler, you don't need to buy a ruler in a short time again.