The Cat combine chopper rotor and also the John Deere optional fine cut chopper rotor are made by Redekop. I am using one for the first year on a 1480. It doesn't just chop the straw, it turns it into dust.Then it spreads the straw and chaff 30' wide if you want. It doubles as a chaff spreader cause the caff slides down into the chopper. Takes some power, but I think it's worth it. Good guy to talk to is Denny Neubauer at Radcliff, Iowa. His phone is toll free 888-387-2627 or 515-893-2320.