I've had my Roomba for over a year now and have replaced the original casters a few times. Then I bought this one. The gray roller heated up, causing enough friction to smoke and melt both one side of the roller and the bracket holding the rollers. It was so damaged I had to replace this unit for $70 from iRobot and another $30 for new original rollers. Fortunately, the reel seat could be replaced. I will never touch non-original parts of my vacuum robot again.
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