Explore and learn about 2D shapes — circles, and regular and irregular polygons including triangles, quadrilaterals, and more. Blue plastic shapes help students understand common shape families. Green plastic shapes are designed to show students regular and irregular versions of the same shape. Use the double-sided poster when introducing the names of the shapes to students. Made from polypropene and thermoplastic rubber. Set includes 4 packs of 2D plastic shapes (38 pieces per pack) and 4 double-sided, color-coded posters measuring 8.25" x 11.75" . Small square measures 1" and large square measures 1.75" .