Made from 100% SolarGuard Nylon, America's No. 1 choice for Flags. Heading is sturdy duck with strong brass grommets. The Flag we manufacture is the darker blue color."fast-drying, the dyed design conforms to official specifications. Available in five sizes. In 1952,the Commonwealth of Puerto Rico adopted the current Flag design, which was originally unveiled in 1892 by the Puerto Rican Revolutionary Committee, as its official standard without specifying the tones of colors to be used.