Size: 229mm x 305mm Sheets: (36 sheets / 72 pages double-sided) * 2 Paper: 300gsm 【Easy-to-Use Watercolor Paper】 This is an extra-thick 300gsm (0.47mm) watercolor block paper. The medium-grain surface is easy to handle, allowing for free expression with techniques like blurring, bleeding, and fading. This set of two is cost-effective and recommended for watercolor beginners. 【Compatible with Various Art Materials】 The use of neutral pH paper prevents paper degradation due to oxidation, preserving colors beautifully for a long time. It is compatible with various art materials such as watercolors, water-based markers, alcohol markers, colored pencils, and pastels. It is resistant to bleed-through and is useful for a wide range of applications, including drafting and illustration. 【How to Use】 You can cleanly detach the sheets by inserting the included block leaf in the center and sliding it left and right. Peel off slowly and remove any remaining adhesive before drawing. ※ One of the two books is unopened, and the other is opened but unused. Thank you for your understanding.