When I put these reels in my Roomba, it rumbled, clicked and barely lifted anything off the floor. I opened up Roomba to see if the rollers were misaligned, but they were - there wasn't debris inside Roomba that was making that noise or slowing down performance. It didn't work properly until I put the old Roomba brushes back in, although they were a bit torn. They still worked better with those junk reels.