MyStemKits Math and Geometry Learning Kits 20 sets of 8 for sale. Each set is $10 or message me for bulk discounted price please. Comprehensive collection of MyStemKits educational math tools. These plastic kits include various sets such as Partitioning Rectangles, Angle Testers, Partitioning Circles, Basic Shapes (Triangles, Polygons, Quadrilaterals), and Parallel Line Testers. Each set is organized in its own resealable plastic bag with color-coded components.