Our photographic enclosure paper is a unique alpha cellulose paper developed by Conservation Resources for negative and print envelopes. It is a .007 paper with a neutral pH and is free of both sulfur and lignin. This soft paper will neither abrade nor scratch your images. It offers superior strength and durability, displaying a folding endurance of over 1000 double folds in the weakest direction at 1 kg. load. This paper is a fine choice for interleaving photographs, or for fabricating your own custom enclosures. The grain direction is short (26-1/2) on the 26-1/2 x 29-1/2 and long (33-1/4) on the 23-1/2 x 33-1/4 sheets. It is sold by the sheet in a minimum of 10 sheets.