Let employees be warned that propane gas is present in the area by marking it with the "Propane" sign. This danger sign is ideal for construction areas, oil refineries, and others where propane tanks are present. Made from high-quality polystyrene plastic, this safety sign is best for indoor and outdoor use as it can withstand elements like moisture and weather conditions. It's also lightweight and flexible, so it can adapt to any given surface when mounted on uneven surfaces. With pre-drilled mounting holes and radius corners, this safety sign makes installation quick and easy. Danger sign Polystyrene plastic Weatherproof Moisture-resistant Indoor and outdoor use Pre-drilled mounting holes Rounded corners Sizes: 10"x14" - 14"x20"