Material: Each protractor in this 10-pack is crafted from high-quality, thickened PS material, ensuring durability and resistance to breaking. The smooth, transparent design not only aids in precise measurements but also withstands frequent use, making it ideal for educational settings. Measurement: Featuring a semicircular design that spans 0° to 180°, these protractors offer clear bidirectional scales. Additionally, they are equipped with edge markings in both centimeters and inches, facilitating accurate angle and length measurements for complex geometry tasks. Transparent and Accurate: The clear nature of these protractors ensures that underlying texts or drawings remain visible, enhancing measurement accuracy without obstructing your view. This feature is particularly useful for students and professionals who require in their work. Portable and User-Friendly: Designed for convenience, these protractors are easy to carry in a school bag or pencil case. The central hole is strategically placed for easy manipulation, making it simple to draw angles and architectural designs. Versatile Tool: Ideal for a wide range of applications, from classroom education to professional drafting, these protractors as essential tools for anyone involved in mathematics, engineering, or art. They also make thoughtful gifts for students, educators, or anyone needing reliable measurement tools. Color: Transparent Material: plastic Package Contents: 10*clear protractor 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.