The C1-series astromech droid, also known as the C1 model, was a type of astromech droid used during the Clone Wars and the reign of the Galactic Empire, though by then they were considered antiques and had passed their manufacturer's expiry date a few decades prior. They had three mechanical arms to manipulate objects with, and featured an electrical arc welder. C1-10P, a droid nicknamed "Chopper" who served on the Ghost, was a C1 model, although he was mismatched after years of repairs and patch jobs.