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12 Pieces Set Value Combination: Includes 10 standard semi-circular protractors, each bottom ruler is 10cm (4 inches) long, lightweight and thin design is easy to store in a book or pencil bag. Transparent Material: Made of engineering plastic, good transparency and not easy to deform, long-term use still maintains accurate scales, excellent resistance to wear and tear. Professional Teaching Design: 180 degree standard semi-circular shape, clearly marked inside and outside the double scale, to meet the needs of basic geometric measurements, is the ideal tool for learning mathematics. Ergonomic Details: 5.5cm height with smooth edge design, smooth measurement without paper jam, arc shape saves storage space, easy to carry around. Multi-Scenario Application: suitable for students' classroom practice, teachers' teaching demonstrations and simple engineering drawings, helping to improve the efficiency of geometry learning, it is an essential stationery for STEM education.