Flip Cards Sound & Light Signal This pack of Flip Cards illustrates the signals made by ships at sea, and covers lights, fog signals and the usual distress and search and rescue signals. Packaged in a plastic envelope, these 2 1/2 x 3 1/2 inch flip cards help you study for exams. Similar to flash cards, there is a picture on one side and the description on the other. There are 47 cards in the pack.