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Fluted polypropylene (Corrugated) sheet is an extruded sheet comprised of two skins separated by vertical ribs. These ribs create a series of flutes that run the length of the sheet. The square box shape of the flutes makes the sheets rigid and strong. The skins and ribs are very thin making the sheets very lightweight, especially compared to solid sheets. Fluted polypropylene is available in a variety of thicknesses and sizes to fit most applications.