The Seawhite Concertina Sketchbook is a genuinely original and exciting new idea.It opens out to give you 70 working surfaces, each a double-thickness of white acid-free 140gsm high-quality cartridge paper.You can use it for drawing and sketching in pencils, charcoals or in ink, but where it really comes into its own is for display purposes, when you can open the book out along a table or shelf to show off its contents.The Seawhite Concertina Sketchbook comes in an elegant hard carrying case to keep it safe.The pages are joined on the long edge making this a portrait notebook.A4 Size 21 x 29.7 cm Pocket Size: 17.5cm x 9cm