K'Nex STEM Explorations - Vehicles Building Set - 131pcs - 8yrs+Let your children unleash their creativity and build their own vehicles with the K'NEX STEM Explorations Vehicles Building Set! With the 131 assorted parts and pieces in this set, children can build up to seven vehicle models with different power sources, such as push power, rubber band power, wind power, and a spring motor! The K'NEX rods and connectors are plastic, but made with high quality construction. Mix and match all of the pieces and be