142 pieces and instructions to build 38 models. Students can construct squares, triangles, quadrilaterals, rhombi, prisms, fractions; plus investigate symmetry. Thirteen challenges included to fine-tune the understanding of shape characteristics and attributes. Set supports 3-4 students working as a team in grades 1-3. Comes packaged in a strong plastic storage case with transparent locking lid. Teacher's Guide included Key Concepts: Shapes, Lines, Segments & Rays, Angles, Congruence, Sides, Faces, Polygons, 2D and 3D Geometric Shapes, Symmetry, Fractions. Set includes 142 K'NEX parts and a 16-page instruction booklet to build 44 models. This set can support 3-4 students working as a team. It comes packaged in a strong plastic storage case with a transparent locking lid. 44-page Teacher's Guide, with vocabulary cards, sold separately.