I bought these sweepers for two of my iRobots. Both have had to be replaced due to daily use over the years. The good thing is they did a direct replacement and it only took a few minutes. The bad: There was disappointment that the two were different divisions. They look the same to the naked eye, but the curved brushes are different. I'm concerned that when replacing these brushes, the new ones I buy won't match one or both of the new blocks. It seems a little suspicious that two packages of the device come and they are different products.