【Double-Sided Scale】: This ruler features both inch and centimeter calibrations, with centimeter graduations on one side and inches on the other. Whether you're drawing or measuring, it's flexible for most situations. A fixed end allows you to easily draw straight horizontal lines. 【Plastic Ruler】: This plastic ruler set is made of high-quality, BPA-free plastic, making it non-toxic and odorless. It's reusable and guarantees a long lifespan. The ruler's measuring range is 30 cm, the width 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, allowing you to see the underlined notes, making it easy to draw and check the measured length. The top of the ruler features a high-quality T-shaped plastic head for easy calibration. 【Practical Hanging Hole】: The tail end of this T-shaped ruler has a hole for easy hanging. You can find a hook or nail directly after use. It doesn't take up space and is easy to use thanks to its clear position. The material is lightweight and won't add extra weight to your hook. 【Practical Tools】: The transparent ruler with black markings is suitable for engineers, architects, students, draftsmen, artists, etc. It's a great assistant for your work and study. With a durable ruler, you won't need to buy another one anytime soon.