Each Board measures 24" x 36" (61 x 91 cm), lines printed in medium blue ink on the finest cover-weight paper stock with a silk finish. This paper is sturdy and thick like the cover of a paperback book, and permanent marker ink will not bleed through. This is a premium product, not a flimsy promotional beer company giveaway. The included King Size Sharpie™ pen writes fantastic on this paper, and is highly visible even from far away or dim indoor light.