The Charles Leonard Protractor Plastic is a must-have tool for young mathematicians. This pack of 12 6-inch clear plastic protractors is perfect for students learning about angles. The protractor features an open center and a 6-inch ruler at the base, with measurements in both metric and inches. The sharply defined graduations make it easy for students to identify angles from 0 to 180 degrees, helping to minimize visual errors. The easy-to-read numbers and clear transparent plastic make this protractor durable and long-lasting, ensuring it will be a staple in any classroom or home learning environment.