NOT KNOWN DETAILS ABOUT FLYER PRINTING

I am very happy with my initially order of flyers from printingcenterusa.com. They ended up suggested by a buddy that has applied them, and I am pleased!I just have an issue about how to get in your System. What's the measurement of an A5 doc (50 percent of the A4) on the platform? I wish to purchase a double sided flyer. I would like to confirm th