Perfect for painting en plein air, Canson Plein Air Watercolor Artboards will never let you down. Ten rigid, Cold-Press artboards are held in place with glue along the spine and have a convenient heavyweight fold-over cover. Usable with most watermedia, including watercolor, acrylic, gouache, and ink. The same quality and reliability you've come to associate with Canson watercolor paper, now in a to-go pad! Acid-free.