Maryland Thin Blue Line Coffee Mug for Police Officers and supporters of Law Enforcement. This Maryland Police mug features the outline of the State of Maryland with the Thin Blue Line. The Thin Blue Line represents the Law Enforcement Officers who protect the State of Maryland. Maryland State Thin Blue Line Police Coffee Mug is made of solid ceramic and holds up to 15 ounces of liquid. Mug is microwavable and dishwasher safe. Maryland Thin Blue Line Coffee Mug would make a great police gift for any Maryland Police Officer, Maryland Police family member, Maryland Police Supporter, Maryland resident, and fans of Thin Blue Line gifts. All of our police products can be customized for an additional fee. Email us for details.