Quickie Automatic Sponge Mop Refill, WITH Locking Nuts, S Type - Blue, 3 Sponges Automatic Sponge Mop Refill With New Dry Shine Sponge Performs As Well As & Even Exceeds The Performance Of Cellulose, Maintains Soft, Flexible Shape Wet Or Dry, Sponge Won't Harden & Crack Like Cellulose, New Quick-Look Refill System Takes Just Seconds To Replace The Refill, Scrubber Strip Included, Refill Type S