I do not advise you to purchase this track due to the extreme fragility of the mechanism and the clearly overpriced price. With its pros: An excellent track with a mechanism for accelerating cars. Toys fly on loops in theory indefinitely until the mechanism stops. Great entertainment for a child. Some cons: The price just doesn't match the quality. Only one machine included. The mechanism requires 4 hefty D-size batteries at once. Of course, they are not included in the kit. The mechanism began to fail within a week. The joints of the accelerator shaft fly out when the car passes. You have to put them back in by hand. At the same time, it is very difficult to disassemble the mechanism to get to the shaft.