The Thin Blue Line is a symbol of respect and support for Police and Law Enforcement Officials; show your support with the Rothco's Thin Blue Line Deal. The decal measures 3" x 4 1/4" and 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.