Spy Spot 4 pack support firefighters and law enforcement officials. Blue line represents law enforcement. Red line represents firefighters and EMT's. 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.