This Fabriano Artistico Watercolor Block is gluebound on all four sides, ideal for painting on the go, outside or without a surface to spread out on. This block features Fabriano Artistico watercolor paper, which ideal for watercolor, tempera, gouache, acrylic, ink, charcoal, graphite and drawing. The paper is sized both internally and externally, making it both absorbent and resilient. This traditional white paper is made without optical brighteners.