The set of 4 construction toy trucks for toddlers includes: 1 dump truck, 1 cement mixer, 1 bulldozer, and 1 tractor with a detachable trailer. The cool kid-sized vehicles can fit perfectly in little hands. And each has a character built right in. The trucks are friction powered (no batteries required) for a fun and handy toy set kids can take with them anywhere. • Bulldozer: The arm of the bulldozer can move up and down, each joint of it can move flexibly to form differently. • Farm tractor with trailer: Fun cartoon driver will amuse your baby, the trailer can be jointed to the main body to carry small items, and the rear door can open or close to exercise the flexibility of baby's hands. • Dump truck: Rotating car hopper can discharge the building materials conveniently. • Cement truck: The mixer can move fast and steady.