Listen - there are thicker / heavy duty blades out there but don't use them. If you use a heavier blade, something else in your mower will break when you hit that stump (I've hit the same stump 3 times now). Use these blades, they work on what they should cut and they bend on what they shouldn't. I've messed up my mower deck and spindle when the heavier blades didn't bend. Word to the wise.