Some cleaning jobs requiring heavy-duty supplies--now you have one. These commercial-sized sponges are ideal for big jobs, when you need a long lasting, durable product. The cellulose design is ten times more absorbent than polyurethane sponges. An ideal companion for warehouse and large commercial facilities. Sponge Type: Cleaning Materials: Cellulose Shape: Rectangular Width: 4 1/4amp;quot;.