Little builders 9 months and up pull these soft vehicles back to get new skills rolling and to let the fun begin! The "rev up" mechanism inside each vehicle (mixer, dump truck, loader, and crane) makes it easy to get big acceleration with just a little input. Pull back, release, and watch it zoom off across the floor! Rolling, grasping, and pulling back is great for developing motor skills and hand-eye coordination. A variety of colors, shapes and sizes, illustrated characters, and everyday themes inspire conversation, cognitive connections, and imaginative play! Built to last, the vehicles feature a removable wipe-clean wheelie insert and washable fabric surface. K's Kids baby and toddler toys nurture early childhood development in three key skill areas: physical, cognitive, and social. With interactive designs and multisensory features, they promote constructive play and effortless learning, keeping interest high and new skills flourishing throughout the baby and toddler years!