The 8.5 x 3.5 and 11 x 4 are the most popular dimensions for this essential grassroots campaign product. The 8.5 x 3.5 is the smallest and a common size for door hangers. Recommended for designs with a central image and minimal text. The 11 x 4 is the longest size of them all. It's the most visible and attention grabbing among the dimensions. A half-fold option is also available if you need more space without having to increase the overall size.