Bought these brushes for my Roomba. I have several Roomba vacuums so I keep a supply of brushes on hand. I put these brushes in my 650, the vacuum ran for about ten minutes and then shut off. I wasn't sure what the problem was. I disassembled the whole vacuum cleaner and cleaned everything. Got it back but it still goes off after ten minutes. Put the old brushes back and everything will work. I've narrowed it down to a rubber brush. The rubber is twisted and I believe this is causing the weighted rotation and when Roomba detects this it turns off the vacuum.