I bought these thinking any replacement would work for my i7 Roomba. I'm sorry to say it isn't. I have ordered other generic replacement parts and they have worked fine, but this company's brushes are really bad. The tolerances around the spindle are too great, causing the brushes to bump against each other and the brush housing when Roomba is started. The noise is pretty loud, and worse, I'd worry that the constant banging against the chassis could damage the Roomba. I am sending them back as they are just not as advertised.