Spy Spot 4 pack support United States military, firefighters and law enforcement officials. Blue line represents law enforcement. Red line represents firefighters and EMT's. Green line represents the United States military. Each sticker measures 4" x 2.5". They are waterproof and UV resistant. Stickers can be placed inside a home, office, or vehicle. Alcohol pad is included. Alcohol pad must be used to wipe surface of sticker. Clear coat from front of sticker must be removed.