Presentation triangle easily sets up in a landscape presentation format and then folds back down into a standard art portfolio for easy transport and storage. Display the included 24 sleeves for 48 views. Included PolyGlass pocket sheets are crystal-clear, acid-free, and archival-safe. Presentation Triangle also includes thick gauge, acid-free mounting paper and a reversible spine insert. Presentation Triangle is made of durable polypropylene.