EAI Education Exploragons 360 Student Set - Set of 84

These are great with one minor exception. I wish the connectors were the same distance apart on all pieces, regardless of length, which would allow for easier discussion.

These are perhaps my favorite math manipulatives. I use these to teach many topics in high school geometry, including triangles, quadrilaterals (including rules of diagonals), and circle geometry. I wish I could get a set that had two circles and two protractors to increase versatility. Students love using these and the sizes were crafted with a lot of thought to allow for diagonals to fit properly, etc. (My younger children love to play with these also, and they can create many interesting creations.) Pretty durable, as they have had lots of use over the year and still work perfectly.