VSS Premium PLUS Rice Paper Inner Sleeves Tested and certified by an independent lab in the USA to meet ISO PHOTOGRAPHIC ACTIVITY TEST ISO 18916! A rather rare size to find in this format. Also available in 12 and 10 inch format! 2 mil rice paper, standard square, anti-static. HDPE, high density polyethylene film, only virgin resin, no recycled content. Twice as thick as most competitors, but at a low price.