Best Made Co. has created 40 nautical flags based on the International Code of Signals, drafted by the British Board of Trade in 1855. Each flag represents a letter in the alphabet, a number, or an answering pennant. These flags are traditionally used to communicate urgent seafaring messages. The flags are made from 200 denier marine grade nylon and measure 12″h x 16″w. Hang them on your walls, tack them up in your boathouse, use them on your sail boat!