Warning No Lifeguard Sign (14 Years and Under) 18 x 24 Inches on Heavy Duty White Aluminum All of the swimming pool and facility signs are of the highest quality and predrilled for easy hanging. Each sign is printed using our high-quality weather and sun resistant inks. All four corners of signs are pre-drilled for easy mounting. The aluminum signs are recommended for high wind environments. Recommended for mounting on walls or other flat surface mounting.