3 years & up. Building upon the multi-faceted early childhood development benefits of unit block play, this solid beechwood truck is designed to overlay a lesson on how a simple machine works. This large cement truck carries a cement mixer which is connected to the wheels of the truck by five different gears. When the truck is moved, the cement mixer turns, teaching children to recognize and investigate the mechanics of using gears. 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 15.25”H x 5.5”D x 9”L.