Zoom-Zoom! The "rev up" mechanism inside each of these four vehicles makes it easy for babies and toddlers to get big acceleration with just a little input: Pull back one of the soft vehicles--then release to see it zoom off across the floor! Develop fine motor skills and hand-eye coordination with the action of grasping and pulling back while developing large muscle groups and coordination with "driving" and collecting (pull, release, crawl). These soft fabric vehicles are bound to be popular at playtime, but with four exciting vehicles there are enough to share. And parents and caregivers will be grateful for the removable wipe-clean wheelie insert and washable fabric surface!