The Quickie Clean Results Automatic Roller Mop Refill is a poly sponge that always stays soft for gentle yet powerful cleaning. You can rinse it clean to use again and again. With 12 in., its great for larger area floor coverage. This sponge mop refill also includes a scrubber strip and 2 locking nuts to secure the sponge to the handle. Change the refill sponge every 3 months for optimal performance.