2022 Highline BP661 Bale Processor, Bale Processor, The BP 661 Bale Pro® is also a great option for cattle operations looking for a durable, well-engineered bale processor. An alternative to the BP 660 Bale Pro®, the 661 Bale Pro® has a slat and chain processing chamber with an offset flail drum. Expand your BP 661 by adding a Feed Chopper™ and Grain Tank.