The Quarantine "Q" flag is 12 is constructed of high-strength nylon. Flown when entering a foreign port or when returning to a US port from a foreign cruise. Take it down and replace it with a courtesy flag after immigration formalities are complete. The yellow quarantine flag is universal (Q letter in the international signal alphabet). Material: • For outdoor display; • Nyl-glo 100% heavy weight nylon; • Specially treated to minimize sun and chemical deterioration; • Extremely durable and fast drying; • Brilliant colors; • Engineered to resist damage from the sun's UV rays; • Finished with strong canvas headings and large grommets. Size: 12 X 18 Inches.