4 PACK Shark Advanced Microfiber Compatible Pads (XT3601) S3501, S3550,S3601,S3901 For use with select Shark steam pocket mops including S3601 and S3501BB Xt3601 Shark Steam Mop Cleaner Refill Pad for S3501 & S3601 Mop pads are infused with Microban; product protection to help prevent the growth of odor causing bacteria on the pad; Your mop pad will now stay cleaner and fresher between uses 4 PADS.MACHINE WASHABLE This is a generic product.