You can buy Lo Mein and ramen noodles near other shelf-stable Asian food items. They are straight and about 5 inches long and come with multiple 1-inch thick bundles in a package. You certainly could use the ramen noodles that are wavey that come with the flavor packet, but it’s not going to look like Lo Mein you get for take-out. Look for the more authentic stuff! It has a great texture and isn’t expensive.