4B-X
this research droid was part of the Alliance's droid pool at the Massassi Base on Yavin 4, shortly before the Battle of Yavin. After the destruction of the first Death Star, 4B-X was assigned to the crew that escorted Trux Zissu to Delantine. 4B-X was a short, barrel-shaped automaton with a large datascreen for a head and a feminine personality. 4B-X was the latest model of her series, and was designed to operate in nearly any environment. Instead of feet, 4B-X had four long legs that ended with tractor-wheels which could be retracted if necessary.