With a one-two cleaning punch, Swiffer Sweeper is designed to sweep and mop your floors. Thick dry sweeping cloths conform to the surface of your floors and grout lines, trapping and locking dirt. Wet mopping cloths dissolve dirt and grime for good, trapping it in its core and locking it away. Do not use Swiffer Sweeper wet cloths on unfinished, oiled, or waxed wooden boards, non-sealed tiles or carpeted floors. Some assembly required.