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 material is ten times more absorbent than polyurethane sponges. An ideal companion for warehouse and large commercial facilities. Sponge Type: Cleaning; Material(s): Cellulose; Shape: Rectangular; Width: 4 1/4″.