This cargo truck is a nine part puzzle (with all those boxes) that rewards your child with a working cargo truck. The boxes have lids that come off so you can stash treasure inside. They also stack on top of each other so they can be stacked up and knocked down. This stem educational toy truck encourages early childhood development of problem solving, creative play, and fine-motor skills in kids aged 3+. Nine part stacking truck toy Parts Interchangeable with other Luke's Toy Factory toy trucks The cargo boxes are designed to stack! Made from 30% sawdust and 70% safe, certified, clean plastic Made 100% in the USA No paint. No glue Waterproof, Sink washable Safety tested & certified for ages 3+ Dimensions: 6.5" long x 3" wide x 4" high