The Swiffer Heavy-Duty Dust Kit Comes With A 3' Extender Handle And 12 Heavy-Duty Duster Refills. Refills Are Designed To Trap And Lock Significantly More Dust And Allergens Than Regular Or Feather Dusters. Each Duster Features 360-Degree, Specially Coated Fibers For Comprehensive Cleaning On Most Surfaces. They'Re Great For Cleaning Blinds, Knickknacks, Fan Blades And Other Hard-To-Reach Places.