A set of 32 three-way, 12 four-way and 12 five-way connectors and 120 straws in four colors and three sizes to give children hands-on experience of constructing squares, rectangles and other polygons and to create 3-dimensional shapes of their imagination. Very useful for teaching angles. The following concepts can be taught easily through the use of these JODO straws : 2-D AND 3-D SHAPES, Open and closed figures, Concept of triangle, quadrilateral and polygon on the basis of sides and angles, Identifies the basic 3-D shapes such as cuboids and cube by their names and Introduction to angles.