Soft polyurethane covers with soft smooth texture and feel; Front cover has laser drilled holes; Flexible enough to roll up Unique Flexible binding that firmly holds the pages but allows the covers to be folded back to back; Hand assembled and hand finished by Thai craftsmen; Smooth hand-sanded edges and rounded corners Smooth premium acid free paper that is fountain pen friendly Unique soft binding that firmly holds the pages, but allows the covers to be folded back to back without damage; Hand assembled and hand finished by Thai craftsmen; Smooth hand-sanded edges and rounded corners Innovative Zequenz 360 Roll Up Journals offer a 360 degree roll up feature with complete back to back fold up when desired. The curved binding uses special organic nontoxic glue that firmly holds the pages, but allows unlimited flexibility for greater functionality in a wide variety of settings and uses. Recipient of both the prestigous DEmark Award for DESIGN EXCELLENCE and Gmark Award for GOOD DESIGN. Zequenz 360 notebooks are the finest flexible notebooks available. The soft covers are premium polyurethane with a leather like look and feel. Fountain pen friendly smooth premium acid-free paper is used for greater writing comfort. The paper is made from sustainable farmed forests in Thailand. Each notebook is hand-assembled and hand-finished by Thai craftsmen with close attention to detail ensuring a perfect curved binding and smooth hand-sanded edges and rounded corners. Zequenz 360 journals are highly rated in respected blog reviews and they are a big step up in quality from Chinese mass market products.