With our exclusive Pull Down White Board chart system you get space saving, tear-proof, pull-down and roll up action, and the hanging chains are included. Choose from Venn diagram, grid, polar graph, 3-D graph, and many more! The dry erase surface is perfect to use for class lectures! Students will like being able to see how to graph and work out other problems. Visuals are more likely to catch students attention rather then just talking.