Before revision:  The microrocker bots are further equipped with sharp  tips that can get engagedvia application of DC-only or low frequency magnetic fields. This novel control method offers an attractive solution to replace the multiple bulky coils traditionally used for magnetic actuation and control, as well as allows for a more flexible and simple approach towards microrobotics motion control.
After revision:  The microrocker bots are further equipped with sharp tips that can be selectively engaged.