BETTER THICK PAPER: Sketch book is made of 120 LB / 200 GSM thicker papers, to make sure this sketchbook not be wrinkling through drawing or erasing many times. Paper of making this drawing book is thicker than other sketch books, allowing all dry medias like sketch charcoals, colored pencils, oil pastels, crayon and some wet medias like thin markers and ink pens to be used in this sketchbooks. However, this sketch pad is not good choice for watercolor brush and thick alcohol markers. PREMIUM HARDCOVER PROTECTION: This mixed media sketchbook is using durable hardcover to protect the art work anytime and anywhere. The hardcover is made by environmental friendly PU leather, which has comfortable touch to provide happier feelings while sketching or carrying. The drawing notebook has square dimension design to make the art work be easier to save in cell phone without any image cropping and share on social media. ACID-FREE SKETCHING PAPER: This sketchbook for drawing is consist of acid-free mixed media paper to protect your sketch work from color fading. Your art work and inspiration can be well protected for many more years. This drawing pad do not choose bright white paper to make the sketch look more natural. The hardcover sketchbook designs 8x8 inches mixed media paper to provide the best sketching experience. PORTABLE & PRACTICAL DESIGN: The sketchbook mixed media develops upgraded perforated pages to make the sketch be easily tore off if you need. This watercolor sketchbook designs inner pocket on back cover and ribbon bookmark to providing better sketching experience. The small sketchbook has elastic closure band to make easier and safer to carry outside.