What do you want to doIJ The only rolls that really cut up the stalks from the point of engagement on up are the knife rolls on a Case IH. They will not cut all the stalks, and if this is what you want get a big shredder and you can really do the job. I personally think the standard fluted rolls on the deere are the best bang_buck by far. I am sure the knife rolls will extract more fuel to run them for, to me at least, no reason whatsoever. GS