Tough steel, made for sandy conditions for longer wear.
I have changed 20+ lawn mower and tractor blades in my life, never had one that was this difficult to put on - I cannot figure out why one blade is continuously cutting at a different height from my 42" craftsman tractor. I put the old factory ones back on and they worked perfectly, not sure why this set seems to cut lower then my OEM ones? They do make a difference though cutting through thick grass and lots of leaves
nice blade good even cut