I teach 9th Grade Geometry and was looking for a good, simple protractor to make our first semester's lesson plan easy and hands-on. The 6 Protractor has been the perfect tool for our class. I really prefer the 6 protractor to anything more old-fashioned and complicated. It makes the lessons quick, efficient and fun, while still getting the job done. Not to mention, I purchased these for practically pennies! Highly Recommend!