SOFOXYI is a direct replacement for my Eufy RoboVac 11s roller brush. It fits well and works for me with no problems. I would buy this product again. Pulleys wear over time where they connect to the motor that drives them. The end result is loosening that makes a loud and annoying pop as the vacuum and brush rotate. Replacing it with a new brush fixes that and gives you back a comfortably quiet vacuum cleaner. Oh, rest and peace!