3 years & up. Building upon the multi-faceted early childhood development benefits of unit block play, this sturdy wooden truck is designed to overlay a lesson on how a simple machine works. This large wooden dump truck uses levers to move the flatbed for loading and unloading. Use Unit Blocks (sold separately) along with this Block Science Big Truck to teach simple machine and STEM concepts while encouraging construction, deconstruction, teamwork, social interaction and self-expression. Measures 14.75”H x 5.5”D x 8.75”L.