Van Gogh Cold Press Watercolor Paper Black Pads and Blocks are artist-grade paper with a fine grain surface, 100% cellulose, 140 lb./300gsm, acid-free. They are especially suited for use with metallic and interfernce colors. Pads are glued on one side, blocks are glued on all four sides. Also suitable for use with tempera, gouache, acrylic, ink, charcoal and pencil. Watercolor Paper Pad 9x12in Black 140lb 12 Sheets