It helps children build confidence, patience, dexterity and concentration, practice hand-eye coordination and fine motor skills Mix and Match: The interchangeable parts allow imaginative play of mixed assembly and dis-assembly. Five-in-one Military Vehicles Set: Comes with five cars (including missile car, armored tank), one hand screwdriver, several screws and many accessories, they convert into a dinosaur defender robot - a genius combination of dinosaurs, cars and tools Learn to Use Tools: Use the hand screwdriver to take apart the cars (40 pieces) or build a transformer action figure. Some parts use magnet to click.