These are the robots.

These motorized percussion instruments are designed with the intention of producing percussive attacks on objects such as to elicit sound from them.

Each instrument consists of a motor connected to a battery and an on and off switch. The shaft of the motor is connected to some sort of arm or vibrating apparatus that swings about and hits things.

IMG_2352
IMG_2343
IMG_2342
IMG_2341
IMG_2348