I want to design my own circle banners! What are the dimensions?

Circle banners are 540 x 110 pixels. Of course, you can upload any photo larger than this size and then crop it to the exact size using Behance's crop and resizing tools. Keep in mind that, in order to save your banner image as the new banner for the circle, you must select the crop button to save.
 
Watch Video: Scott & Matias talk about using "circles" in the Behance Network