Cellophane (Cello) is a high clarity film with the density and thickness of paper. It is made out of cellulose, a wood product, so its properties are very similar to paper.
It looks like Polypropelyne and the way to tell them apart is if you twist the cello film, it will not bounce back. It will stay twist just like paper does. Cello is very expensive to produce so we are slowly phasing out this product.