From the Manufacturer: Oregon is a world leader in mower blade manufacturing. Our patented Gator Mulcher 3-N-1 blades redirect the airflow allowing the grass clippings to be cut into small pieces. They will allow mowers not equipped with a mulching blade to reduce the volume of blade clippings and will reduce your fall leaf cleanup time. Unlike most mulching blades, they will allow you to bag your clipping and leaves, but because the pieces you will stop less often.
