Colourfix Plein Air boards provide a rigid, lightfast and acid-free substrate for pastels, oils, acrylics, inks, watercolors, gouache, pencils and charcoal. These 1200 gram archival boards are available in 16 colors as well as natural which is primed with Magical Clear. The 16x20" boards feature a 12x16" work area and may be trimed to 12x16 or framed at 16x20" by using a mat mount with a 11-1/2 x 15-1/2" opening. Boards come in a reusable clear archival bag which makes it easy to carry your artwork after painting in the field.