innovative & exciting product! The 6-inch diameter outer ring acts as aclassic protractor, while the separate inner circle easily rotates to draw circles just like a compass. And the 8 integrated circle templates built into the inner ring for drawing accurate small circles far easier than using a standard compass. Unique product is much easier for young children to manipulate and use than a standard compass, and the integrated design means that they can more easily understand how angles and measurements correspond with each other. The perfect tool for young students working on mastering geometry and angles!