These pads are for the XL Rectangle Mop Head ONLY!  If you do not have this head, you need all-purpose cleaning pockets (S3501). The open area mop head replacement pads have 33-percent more surface cleaning area than the all purpose cleaning pockets. It is the perfect application for cleaning large rooms and larger floor areas. The absorbent micro-fiber pocket loosens lifts and locks in dirt. When you are finished just toss the reusable mop head in the washer. The included finger loops make it easy to put on and remove the mop head.