Review on DLD 13 Pack Replacement Parts - Compatible with iRobot Roomba s9 (9150) s9+ s9 Plus (9550) - s Series Wi-Fi Connected Robot Vacuum Cleaner Set: 1 Main Brush, 4 Filters, 4 Side Brushes, 2 Bags by Amy Maeva

I bought an OEM kit from iRobot a month or two ago and used that for comparison. Side by side, it's very hard to tell the difference between the two. The filters are made of different plastics, but are otherwise the same size, shape, and look roughly the same. That's a very good deal - with a new set of rollers, some brushes and filters, my Roomba lasts a good 7 months.