I bought these to replace the brushes on my Debot 500. You looked like a winner. They fit great. That's where the greatness stopped. The brush strands seemed to wrap around each other so I cut them to match the ones that came with the vacuum. This didn't work either. My vacuum stopped and beeped and didn't seem to pick things up like your original brushes. So I accepted it and ordered expensive parts from Ecovac and my vacuum robot works perfectly again.