B-series battle droids

The B-series battle droids or the B-series is a heavily mass-produced series of Battle Droids used primarily by the Trade Federation, Techno Union, and Confederacy of Independent Systems up to and during the Clone Wars. The B-series is fielded mostly by the New Separatists, who used vast numbers of these droids to overwhelm their enemies. The B3 Ultra Battle Droid was never mass produced though.