Grades 3 & up. This collection includes everything you need to kickstart your simple machines curriculum. 6 individual STEM building kits are included. Each individual set can support 2 to 3 students, working in teams as they learn all about different Simple Machines concepts. Each pack includes a comprehensive, standards-aligned Teacher's Guide and enough pieces for 12-18 students. Each of the 6 sets is individually packaged in a handy, reusable tray with a snap-on lid for easy classroom storage and organization.