RE: Hirobo XRB PICS!!! and build info.
I can't speak from experience, because my blades have not arrived yet, but it is my understanding that you can use blades for the housefly, dragonfy 5-4, Esky lama, and possibly the blade cx. Basically any of the cross rotation helis so long as they are basically the same rotor diameter (350mm). Keeping in mind that the XRB is designed so that the blades will break in a crash/strike w/o damaging the helicopter shaft, or control arms, or blade clamps. When you put on the stronger blades....if they don't break something else may. You know the whole weak link theory.
Also Walkera/dragonfly has a new xrb model 10 that is larger. I've heard those blades do not fit as they are too large.