Roomba 800 or 900 series left wheel. Also fits in the older 500, 600 and 700 models.
If you have doubt about which wheel to order because left and right wheels look the same. You can find L(left) or R(right) on the wheel you want to replace.
It is easy to remove the wheel using a small Phillips screwdriver.
This is an original iRobot product. Product Number: Artikelcode 4420153.