"I am C-6RR, a class-six protocol droid in the service of Numen Brock."

C-6RR, also known as Sixer was Class-six protocol droid in the possession of the Balmorran resistance fighter Numen Brock around 3642 BBY during the time of the Galactic War. He was stationed in Farnel Outpost on Balmorra where he welcomed Voidhound when the latter came seeking for his master. When Voidhound returned from his mission to the Okara Droid Factory, Sixer informed him that Brock and several other resistance fighters had been captured by Imperial troopers during a patrol, asking the Smuggler Captain to rescue them.