Unique scrubber pad removes scruffs and is safe for the tile and no-wax vinyl flooring. Extra large, highly absorbent cotton blend head. Fits Mr. Clean Twist Mop No. 4145 or Butler Super Mop No. 1591 and No. 1595. Illustrated refill change manual enclosed. Note: To keep your home clean and germ-free, we recommend changing your mop refill every 3 months.