The Pina Zangaro 11x8.5 Presentation Book Bamboo Natural has a sustainable and made of an absolutely beautiful material. For this book, Pina Zangaro bonds bamboo to aluminum to create a composite that is lightweight and strong. The book's screwpost design allows for easy adding and subtracting of standard format inserts (sold separately). This presentation book includes steel screwposts that accommodate up to 15 sheet protectors (30 sides). It also uses extensions to increase capacity (sold separately).