Ive been using a leowen concave and feeder house chain for about the last 5 years and they are great products. The chain is the extra HD with chrome pins and the highest count of slats for better small grain feeding, and ive ran I think about 20000 acres of wheat with it and its just now showing roller wear. The concave has about 22000 acres across it and is still relativley square and still has a few more seasons left in it. I will continue to replace these parts with leowen parts for as long as im in business.