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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iRobot Roomba Authentic Replacement Parts - Roomba® s Series Corner-Sweeping Brush, (3-Pack)

Product ID: 317976106

Details

Brand
iRobot
Colour
Black
Model name
iRobot® Parts-
Special features
Edge Cleaning
Surface recommendation
Wood Carpet

📐26° angled sweep for deep corner cleaning

🔄3-pack for extended maintenance

🧹5-arm corner brush design

Description

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

TRIPLE PACK VALUE - Three replacement brushes ensure your Roomba stays peak-performing longer
FIVE ARM SWEEP POWER - Five 30mm brushes maximize debris capture where others miss
EFFORTLESS MAINTENANCE - No assembly required—swap brushes in seconds and keep your home spotless
SEAMLESS COMPATIBILITY - Engineered exclusively for Roomba s Series for perfect fit and function
PRECISION CORNER CLEANING - Special 26° angled brush targets hidden dirt in corners and edges

This 3-pack of authentic Roomba s Series corner-sweeping brushes features a unique 26° angled design with five 30mm arms to clean deep into corners and along walls. Compatible exclusively with Roomba s Series robot vacuums, these replacement brushes ensure optimal dirt pickup where standard brushes can’t reach, extending your vacuum’s efficiency and lifespan.

Specifications

ASIN	B00BKO4DZS
Batteries are Included	No
Battery Life	5 hours
Best Sellers Rank	#156,579 in Kitchen ( See Top 100 in Kitchen ) #421 in Vacuum Brushes
Brand Name	iRobot
Color	Black
Compatible Devices	Roomba s Series Robot Vacuums
Control Method	App
Controller Type	App Control
Customer Reviews	4.5 4.5 out of 5 stars (839)
Filter Type	HEPA
Form Factor	Robotic
Global Trade Identification Number	00885155019141
Included Components	3 Corner-Sweeping Brushes
Indoor Outdoor Usage	Indoor
Item Dimensions L x W x H	83.8L x 83.8W x 17.8H centimeters
Item Type Name	Robot Vaccum Accessory
Manufacturer	iRobot
Manufacturer Part Number	4646123
Model Name	iRobot® Authentic Replacement Parts- Roomba® s Series Corner-Sweeping Brush, (3-Pack)
Model Number	4646123
Number of Items	3
Number of Packs	3
Other Special Features of the Product	Edge Cleaning
Portable	No
Power Source	Battery Powered
Recommended Uses For Product	Cleaning indoor floors with a wireless robot vacuum cleaner
Style Name	Modern
Surface Recommendation	Wood, Carpet, Tile
UPC	885155019141
Unit Count	3 Count

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