|C-B3 cortosis battle droid| C-B3 cortosis battle droid High-
intensity double laser cannons (2) |Chronological and political
information| Their outer shell was made out of cortosis, a
substance that could block lightsaber attacks. The black outer
shell was clamped to the droids' frame in formfitting plates.
The droids also had the same intelligence matrix as the similar
B2 battle droid, however, they lacked the gripping hands of the
B2 battle droid, since their arms ended in double high-intensity
laser cannons. The ball joint of the wrist allowed the cannons
to swivel in almost any direction. The droids could also use
their arms to block lightsaber blades. There was one weakness to
lightsabers in the droids' armor, discovered by Anakin
Skywalker. A very precise overhead slash with a lightsaber
targeting the small gap between the two breastplates would slice
a cortosis droid's torso in half. Production began when Wat
Tambor put two internal teams against each other for the
upcoming separatist B3 unit. Although