These Electrolux PURE i9 Powerbrush attachments give your robot vacuum an extra boost. The two-pack includes specialized brushes that help pick up more dirt and debris as your vacuum moves around. They're designed to work with Electrolux PURE i9 models making it easy to keep your floors clean. Just pop them on and let your robot do the work. With a one-year warranty you can feel good about this handy upgrade for your cleaning helper. The manufacturer's part number is ERSB3.