okay ,i know this is a repeat but yesterday i changed blades that had been on since wed morn. about 5 hrs each day . this is my light week.with a little pressure they were still sharp enough to cut your hand . again i was slightly amazed. Coldfire the ball is in your hands . mowing and what you do were made for each other. the people in this buisiness will best know of your process thru LAWNSITE. GET ON BOARD ,A NOBRAINER. sorry to be so emphatic but the lco s need this.