Features: Cotton watercolor paper with accordion fold design offer superior absorbency, tear resistance, and portability for professional artwork, ideal for multi layered washes and detailed brushwork. Cotton sheets (300gsm) withstand heavy pigment applications without bleeding, featuring a unique expandable binding that converts to 12 continuous pages for versatile creative layouts. Designed for art students, professional illustrators, and creators requiring archival quality sketchbooks that preserve colors. Perfect for plein air painting, classroom figure studies, mixed media experimentation, and gallery worthy pieces demanding museums materials durability. Paper mill production ensures composition, making this foldable art journal safe for sensitive users while supporting sustainable artistic practices. Specifications: Component: Paper Color: White/Black/Blue/Pink/White1 Size: Approx. 4.68x5.11inch(19x13cm) Package Includes: 1x Professional Painting Book note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.