Product Description 1. These angle measuring protractors can be used in both household and office settings, and are also suitable for students and teachers in schools. 2. They are very convenient to use, which helps to complete work. They are also a good gift for children. 3. Moreover, they are an essential tool in any toolbox. The black numbers are clearly visible and easy to identify, allowing you to read data quickly and accurately. Product Features 1. Color: Transparent 2. Material: Plastic 3. Dimensions: Approximately 10×5.5×0.15 cm / 3.9×2.2×0.06 inches (Length × Width × Height) 4. Made of hard plastic, very lightweight and easy to carry. 5. With a smooth surface, convenient to use and easy to read. 6. The plastic protractors have a common shape, which is highly versatile and can be used to frequently solve math problems. 7. Suitable for painting, measurement, homework, and technical drawing. 8. They are the perfect gift for friends and classmates. Package List 1 set of 20 transparent 180 - degree plastic protractors, 4 inches (10 cm) in size, for angle measurement, suitable for schools, offices, or students' math learning.