What cut of meat does Arby's use in their roast beef sandwiches?
Looking at the slices (see: https://arbys.com/desktop/images/the_meats/beef_n_cheddar.png), they don't seem to have the muscle fibers I would expect to see in beef (e.g. https://www.eatdrinkri.com/wp-content/uploads/2011/03/20110315_charcutepalooza_mar_corned_beef_8.jpg). I wonder if this is a result of the specific cut of the meat? Or the method of slicing (e.g. very thin against the grain?), or something else? This video might help identify the meat: https://www.youtube.com/watch?v=otDoG1OjBZA
I'm hoping to do a copy of their roast beef at home.