The multi-model cabability of ENGINO TOY SYSTEM is proportional to the number of parts contained in the sets- The inventor pro series is the ultimate range more suitable for intermediaste and advanced users who literally play to invent - The models created with these sets are bigger and more elaborate and can move with the new compact dual output motor-- Contains 238 pieces and 1450 connecting points plus 3 volt geared motor- Build structures and machines using this multidimensional construction system- Printed instructions are included for fun easy to assemble models - more plans can be downloaded from the Enginos website- Excellent addition to a home-school curriculum- Another fun- educational product from the company that brings you Snap Circuits