This item is Darda"s standard windup replacement motor. Fits all Darda cars. All of Darda"s 1/64th scale windup race cars are powered by their exclusive, amazing spring coil "Mega Motor". The mega motor propels the model cars at up to 30mph, over distances of 75 feet (this is a scale speed of over 600mph!). The "Mega-Motor" cannot be over wound, and requires no batteries or electricity. It is wound by pressing gently on the car and moving it backwards and forwards.