Can you tell me how often brushes (and rollers) typically need to be replaced in runtime, not months? Wouldn't it vary based on how often you use it?

I understand your question in run time that would be very difficult to answer based on how many times you run it a week. It does vary how often you use it but.....checking your brushes and rollers after each use is very important on how long they last especially if you have a dog or cat that sheds. That being said the hair gets wrapped around the rollers that are rubber and makes Indents like slices in the rubber. As far as the little brush is concerned pick up any fluffy throw rugs (like in the bathroom) that’s where I made a mistake the brushes get tangled in the rugs. Hope this helps !!! I love my roomba S

Why do the corner brush bend and wear down so fast my i7 does not do that

It's normal for consumable parts like corner brushes and filters to wear down over time, and the corner brush should be replaced at least every 3 months.

Does it come with screws ?

The Philips head screw is attached to the brush itself for simple replacement.

Could it work with the j7? And is there any way to make it work with it?

j7 uses the white bristles. they last a long time the black ones fit the s9 about a week and they start breaking off. they are worthless

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🧼 Sweep smarter, not harder—corner dirt doesn’t stand a chance!

TRIPLE PACK VALUE - Three authentic replacement brushes keep your Roomba s Series always ready
FIVE ARM SWEEP POWER - Five 30mm brushes maximize debris capture where vacuums can’t reach
EFFORTLESS MAINTENANCE - No assembly or batteries needed—just swap and keep your cleaning flawless
SEAMLESS COMPATIBILITY - Designed exclusively for Roomba s Series for guaranteed fit and performance
PRECISION CORNER CLEANING - Special 26° angled brush targets hidden dirt in corners and edges

This 3-pack of authentic iRobot Roomba s Series corner-sweeping brushes features a unique 26° angled design with five 30mm arms to effectively clean deep corners and edges. Engineered exclusively for Roomba s Series vacuums, these replacement brushes ensure optimal debris pickup and easy maintenance without assembly or batteries.

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