6 simple machines kits - this collection of 6 kits accommodates 12 to 18 elementary school students. Teams of 2 to 3 students can be using different kits at the same time.Interactive learning – students build real world replicas of simple machines, then see STEM concepts come to life as they progress through the inquiry-based lessons.STEM concepts in action – students learn about gear ratios, gear systems, mechanical advantage, energy transfer, pulley systems, lever classes, wedges, screws, and so much more!Convenient storage trays – each of the 6 sets is packaged in a handy, reusable tray with a snap-on lid for easy classroom storage and organization.Standards-aligned lesson plans – all six sets include a comprehensive guide written by expert educators featuring hands-on, inquiry-based projects that engage students in today’s busy classroom.