The Thin Red Line is a symbol of respect and support for Firefighters; show your support with the Rothco's Thin Red Line Flag Decal. The decal, which measures 3" x 4 1/4", features a gum back that can be applied to any clean, dry surface. Great for cars and home windows. WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects and other reproductive harm.