My 122 deck came with the <FONT COLOR="ff0000">I</FONT><FONT COLOR="000000">H</FONT> hard blades. I put the deck on the 127 and mowed / chopped a wild grown up place when I moved here. I got over a sandstone as big as my #10 boot. By the time I got the deck shut off the sandstone was turned to sand. The blades didn't show a scratch.
Don't know about new hard blades ...
Don't know about new hard blades ...