I've never seen that copter in person, but it depends - did they break on their own or during a crash? If a crash, how far did it fall from and at what angle? And by broken, do you mean the motor won't spin, or the motor has visible physical damage? If it won't spin, it could be other components potentially, or even wiring. In fact, if it is just that it won't spin, it almost certainly has to do with electrical connections, whether they be in the wiring to the motor, or the contact points on the motor itself. You might just need to do some soldering to fix it. I know my niece had an off-the-shelf RC car and it had some pretty crappy soldering, so when she ran into things, the connections would come apart. I re-soldered a bunch of bad solders and it was pretty indestructible after that.