The 26x36cm size is new, unused, and unopened. The 18x26cm size has been opened. Out of 20 sheets, a few may or may not have been used. (There is a small stain on the first sheet in the last image.) Please understand that these items have been stored at home. I would appreciate it if you would purchase both books together. I am also selling other art supplies, so please take a look if you'd like. If you purchase multiple items together, I will discount the shipping cost plus a little extra. Please let me know by sending a combined purchase request or leaving a comment. Thank you. Brand: Product: Pickup Artist: How to Use: Stores: Professional Watercolor Paper New watercolor paper with a "natural bright white" paper color, which is whiter than the general natural white used for watercolor paper. It is perfectly compatible with Winsor & Newton brand watercolor materials. Winsor & Newton's carefully crafted watercolor paper achieves "strength and stability / durability / excellent color development." Paper color: Natural Bright White Weight: 300g/㎡ Material: 100% cotton Features: Neutral paper, no fluorescent whitening agents, internal and external sizing (can be used on both sides)