Review on Enhanced Roomba 800 and 900 Series Tangle-Free AeroForce Extractor Set - Genuine iRobot Replacement Parts by Liz Garcia

I bought these casters and they are not as strong as the casters that came with my Roomba but they seem to work. IRobot wants 29.99 plus 5.60 for shipping and handling. At first I thought the lighter one was slipping off, so the fringe continued to fray. It doesn't seem to be. I didn't notice an increase in noise or a difference in cleaning. My rumba works day after day. We have two cats and two trays. I will be ordering these again from Revain and see if the next set lasts longer. Given the price difference, I'd like to try it. Update.09.30.15 New order came in last week. I am attaching a photo of the new set. I just installed a new pair and when I can access this review again I will post pictures in a few months. I also ordered a kit from a seller in China but they are not available yet.