Swim At Your Own Risk Novelty Large Metal Parking Sign. 12" x 18" High gloss large metal parking sign. Made of the highest quality aluminum for a weather resistant finish. It is lightweight and durable. Pre-drilled holes for quick and easy mounting. Add a ribbon, wire or string to instantly personalize your sign. Individually shrink-wrapped and proudly made in the USA. Most orders ship within 24-48 hours.