This Coreless 8520 Motor for Micro Quadcopters is a very compact and lightweight DC motor. They are rated at 58000 RPM which is more than needed to lift and push your drone to the target. These are less noisy with low resistance. The only drawback of using coreless is the amount of torque they provide, as they are High Speed and Low Torque motors.
1 x Coreless Motor for MICRO Quadcopters 8520