Fridge magnets have more strength than this whole roll and hardly stick to themselves. However, I tried it because I don't know how delicate Roborock E4 is and what is required of him. I only received Roborock in December. I've tried a few hand held magnets near the device and the vacuum feels like a wall. Not so with this thing. The Roborock just rolls over it like it's a carpet bump, which means I might as well put a piece of tape on it to make a nice stripe on my carpet. It's completely useless in my experience, but I usually try to have something nice to say about everything. . Maybe some buns are better than others, and for the most part, it lies flat. Yes, it's as good as I can get.