Discover a new world of shapes design and STEAM learning with the 36 Piece Rainbow Shape Expansion Pack. Featuring our vibrant rainbow colors this pack introduces large equilateral triangles right-angle triangles quarter circles pentagons trapezoids and rhombi to your Connetix play! Carefully curated to engage children in creative play and support STEAM learning the Rainbow Shape Expansion Pack is perfect for extending mathematical understandings progressing engineering skills and sparking imaginations. The ideal open-ended quality toy Connetix grows WITH each child as they learn and their play becomes more complex.