Keep cleaning effectively with the Tornado Spin Mop System Microfiber Refill. This large microfiber, machine washable mop head is a direct replacement for what is included in the box. The Libman Tornado Spin Mop removes over 99% of staphylococcus aureus and E. coli on ceramic tile and wood floors when used with water. Whether you are replacing a worn-out mop head or just want a spare while you're washing your primary mop head in your washing machine, this refill will keep you in the cleaning game.