Self Seal - Double Window Envelopes for Checks makes the process of printing easy too. These come in sizes that are adequate with the popular software in the market. This allows you to easily print the logo, or other business details to give it a completely professional look. The size of these envelopes matches the universal sizes of double window envelopes meant for checks which are in 3 ⅝ inches width and 8 ⅝ lengths.