Tiny Tools for Big Science! A fun, hands-on approach to robotics with STEM activities to educate and entertain children about the fundamentals of mechanical engineering, gear ratios, and tiny machines. Mix and match axles, wheels, arms, legs, and gears in a transparent chassis. This kit includes 10 different builds for different actions creating itty bitty robots that, walk, crawl, spin and more! The transparent gearbox allows kids to watch their little machines work and doubles as an innovative storage case for parts! Details: Includes a fully illustrated activity guide For ages 8 and up Contents: 5 wheels 3 piece chassis 3 axles 2 piece head 2 arms with grippers 2 elbows 2 legs Center roller Extender chassis