Children will never look at physics the same way again with the Nutz ‰Û÷n Boltz Clunkerz set! Here they can put together eight different mind-blowing STEM machines, each with its very own kinetic functions. Children will learn all about STEM engineering components like cranks, axles, and cams. The 64-page instruction manual makes learning about advanced engineering an absolute blast. These machines are also incredibly entertaining and hilarious, perfect for keeping children‰۪s attention.