BUSOHA 200 Pack Dust Corners for Stairs, Stair Dust Corners, Decorative Triangle Stair Inside Corner Dust Guards, Anti-Dirty Dust-Proof Stair Dust Corners for Cabinets, Drawers, Desks, Stairs

These tiny rubber triangles don't do much, except maybe create new places for dust to become trapped.They don't work in corners with (semi thick) carpet on any of the three sides -- the carpet will "swallow" the little corner protectors.The triangles (blue are small, clear are large) have no sort of adhesive, so they pop away from corners after being placed. These are not going to stay in a corner which experiences vibration, movement, or moving air - they'll likely just become clutter. In corners with no activity, they will be prone to dust gathering behind them.With an adhesive, they might be more useful, but I'd still be doubtful.Overall, it's a nice idea, but they don't seem to actually serve a useful function.