Thin Blue Line Thin Red Line Tank Shamrock Black . Patrick's Day Tank This Sporty Tank Is Perfect For Celebrating The Holiday And Showing Your Pride In Our Nation's Firefighters. The Tank Features A Rugged Shamrock With A Solid Red Line Running Through The Center Representing The Men And Women That Defend Our Communities. Specifications for Thin Blue Line Thin Red Line Tank Shamrock: Manufacturer: Thin Blue Line Apparel Fit: Regular Gender: Male Package Contents: Thin Blue Line Thin Red Line Tank Shamrock