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MATERIALS AND SIZE - These 4 inch protractors are made of plastic with a base length of 10 .2 cm, a height of 5.7 cm. They are compact and easy to use QUANTITY - The package contains 50 pcs protractors. The sufficient quantity is suitable for event sharing or long term use LIGHTWEIGHT - Each protractor weighs about 9g, lightweight and portable, it easy to put on your books and notebooks ACCURATE NUMBERS - The black numbers on the protractor are clear and distinguishable, and the readings are quick and accurate MULTI PURPOSE APPLICATION - These geometry protractors are suitable for measure, engineering, design and hobby projects