Needed a set of cars to work with a scalextric set for my 4yr old daughter. Apart from the tiny spoilers on the back of the cars being broken off (almost immediatley), these are tough and work well with the track. To be fair, a 4yr old is probably a bit young for these which is why the spoilers broke, but this does not make the cars work any less well. Also comes with spare pickups, which is good for little fingers which like to push the cars backwards along the track! Terrific product for a good price.