A1 poster size refers to "Super A1" poster size that measures 24" x 36" This is not to be confused with regular A1 which measures 23.39" x 33.11" (594 x 841mm) The a1 poster size is perfect for use with posters, music posters, shop windows, inside houses and club promotions. When printing A1 poster size you should use a high quality xerox gloss coated paper. When … [Read more...] about A1 Poster Size