Grades 1 - 3. Set includes 142 K'NEX® parts and a 16-page instruction booklet to build 44 models. Students can construct squares, triangles, quadrilaterals, rhombi, prisms, fractions; plus investigate symmetry. 13 challenges included to fine tune understanding of shape characteristics and attributes. This set can support 3-4 students working as a team. Set comes in a strong plastic storage case with moveable dividers and transparent locking lid. Teacher's Guide included on a resource CD. Made in the USA.