Rothco Thin Blue Line U.S. Flag 3x5. The Blue Line Flag is a double stitched polyester US Flag with a blue line across the middle. Grommets allow for flag pole use but the flag is also great for inside or on your car. Specifications for Rothco Thin Blue Line U.S. Flag: Manufacturer: Rothco Color: Black/White/Blue Gender: Unisex Features of Rothco Thin Blue Line U.S. Flag Material: Polyester Material Specs: Polyester Package Contents: Rothco Thin Blue Line U.S. Flag Polyester The Rothco Thin Blue Line U.S. Flag is a quality addition to the Rothco lineup. For more great deals on Military & Tactical Gear by Rothco please browse our Rothco Military & Tactical Gear page. Rothco Thin Blue Line U.S. Flag 3x5 14455-3x5