Swiffer Heavy Duty Duster Refills pick up 5X more dust & allergens vs. feather duster after 9 uses. Heavy Duty Duster has Dust-Busting Strips to break down layers of built-up dust, and thousands of fluffy, specially-coated fibers that grab onto dust in every direction and don't let go. 360° design makes it easy to clean hard-to-reach places, like blinds and around knickknacks. Traps common inanimate allergens from cat and dog dander & dust mite matter. 6-count refill pack.