The Bissell ProHeat 2X Upright Deep Cleaner, 8920 features not just one, but 2 brush rolls for a total of 10 powerful cleaning rows. DirtLifter PowerBrushes rotate just like your vacuum cleaner brushes. They are powerful enough to get the dirt, yet gentle enough to use frequently. The Bissell ProHeat 2X Upright Deep Cleaner, 8920 2X DirtLifter PowerBrush system is designed for a deep down and thorough clean.