High Quality & Heavy Weight: Art sketchbook with premium papers that make drawing, sketching, recording smoothily. The covers are made from hardboard which make them very robust that protect masterpieces inside. Acid Free Artist Sketch Pad: Each sketching pad is made of an acid free process which can prevent colour fade over time that keep your artwork looking fresh for years, and remains as bright and lively as possible over time. Portable Size: Drawing book is super portable and fits in almost all kinds of bag, so you can draw wherever inspiration hits you. A5 sketchbook offers convenivence for your creative. Double Spiral Bound: Spiral binding art paper is more durable than glued binding's. The double twin wire binding to be rotated through 360 which makes art pad lay flat and turn page easily. It's easy to rip out pages thanks to the perforated edges. Wide Applications: Vintage paper idea for art sketchbook, memo pad, art book, travel journal, poetry work, scrapbooks. Perfect for professional artists as well as amateurs. Suitable for all types of dry techniques including pencil, pastels, charcoal, sketching sticks ect. Not recommended for watercolor, acrylics, and inks because it can bleed through the paper.