Design Ideation brand SKETCH books are archive quality sketchbooks. Each sketchbook is constructed for durability and longevity. The heavy front cover offers project-tough durability. The extra-heavy back cover provides sturdy backing for sketching when extra support is needed. Design Ideation sketchbooks are fitted with multi-media sheets that are suitable for ink, graphite, charcoal, marker and watercolor paints. The exceptionally thick sketching sheets won't bleed through and will stand the test of time. HANDMADE STUDIO BRAND. Every Design Ideation brand SKETCH book is made individually by hand in the USA. All cutting, punching, sorting, and assembly are completed with manual processes. No automation is used in the making of the sketchbooks.