I bought these because they were significantly cheaper than buying some of the parts on the irobot website. I needed to replace the roller brushes and thought it would be nice to have spares for the other parts as well. Turned off the brushes and my Rumba started rattling loudly as I walked. After pulling each piece out one by one and testing it to see what was making the rattling noise, I found out it was a bright green roller brush. I took it out and disassembled it to see what was wrong with it even though it was brand new. Turns out both roller brushes are made differently for some reason and the light green brush moved freely (don't know how to describe it). I think they were significantly cheaper for some reason. They look just like the original parts but are of terrible quality. Save money and time and simply buy original spare parts from irobot.
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