I bought this product because my rollers are worn and cracked the last 18 months i had a roomba i7. I was happy to put these new rollers in the vacuum to see if they would pick things up better with the new hardware. Well after cleaning 1 (yes, 1) room the new roller broke everywhere. There was nothing tangled on it (hair, thread, yarn, etc.) that could cause it to tear. They were too thin, or manufacturing errors, or something. I can't even tell you that the original commercials have survived. I would pull out hair ties, dart pieces, half a skein of knitting yarn, elastics and brushes would show minimal damage. And here's this thing from JoyBros. Well I didn't cut. Well I guess he cut the rubber on the roller. I'll send it back and get a genuine Roomba replacement.