These angle measurement protractors can be applied for home and office using, school students and teachers. It is very convenient to use, and it is good for completing your work, and a great gift idea for kids. Besides, it's also an essential tool for any toolbox. The black numbers are clear and easy to identify, then you can read quickly with great accuracy. Feature - Color: Transparent.- Material: Plastic.- Size: Approx. 10 x 5.5 x 0.15 cm / 3.9 x 2.2 x 0.06 inch (L x W x H).- Made of hard plastic, very light and easy to carry.- Smooth surface, convenient to use, easy to read.- The plastic protractors are the common shape protractor, it's universal, you can applied to settle the math problems frequently.- Suitable for painting, measure, homework, and technical drawing.- A perfect gift to your friends and classmates.Packing list: 1 x set of 20 Pcs 4 Inch 10cm Plastic 180 Degrees Protractor for Angle Measurement School/Office/Student Math (Transparent)