No need to buy a new handle every time! The Swiffer Duster Refill is here for you. Designed to work seamlessly with model No. 40509 and 44750 starter kits, these dusters fit both the base handle and the extendable one. With 10 dusters in each box, you're all set for a long while of stress-free cleaning. Say goodbye to dust bunnies and hello to a sparkling home!