3X3". Classic felt paper. Includes custom image cover, concealed magnet for soft closure, and frosted slip covers. 10 panels per accordion mini. Please select up to 30 images if you want a different design on each accordion mini, or up to 10 images if you want 3 copies of the same design. Please email us at firstname.lastname@example.org within 48 hours of your purchase if you have a preference as to which photos go in each accordion mini or if you would like to choose the 3 images to go on the cover.