For superior mulching and bagging performance, the Arnold 42 in. AYP Xtreme Mulching Blade Set helps chop grass clippings finer than with standard blades. This can lead to bagging up to 50% more grass and less visible clippings when mulching. This mulching blade set includes sharp-edged blades that cut grass cleanly and make their way through grass more efficiently, reducing overall mowing time and effort.