I run the wavy blades on my 36" snapper pro WB. I don't have a true mulch kit, just a chute blocker. It works fine and I've been doing it that way for years. They work pretty well. They have a little lift to them to help keep the clippings suspended. I side discharge with them on occasion when I have a property big enough to side discharge. Most of my properties are too small to side discharge. It blows clippings in all of the beds. Another plus to mulching.