 Our core business is to design, produce and print business brochures like these:  DL: there are some popular combinations for the DL format including single pages printed on either one, or both sides, 4 page options or 6 page, tri-fold or gate-fold brochure.  A5: half the size of an A4, these are a good way to make a mini-book, or pamphlet.  A4: the ever - popular standard size for many brochures. Not too big and easy to mail or store, you can't go wrong with an A4 brochure.