The 5.5" x 8.5" Karst Stone Soft Bound Notebook is made from high-quality, sustainable, recyclable stone paper with a flexible vegan leather cover. With an expandable back pocket, divider ribbon or bookmark, elastic band and lay-flat binding. This unique, eco-friendly notebook is acid-free, bright white, and waterproof with a premium look and feel. The smooth texture of the 72 sheets of stone lined pages and flat-lay binding provide ample comfort and writing space for your notes and ideas. This stone paper holds a C2C Cradle to Cradle Silver Certification. That means if you do have to dispose of your K'arst notebook; it is recyclable. Through a partnership with 1% For The Planet, one percent of sales of all EcoSmart® products are donated to environmental nonprofits.