Aquatic Technology 5330WA1824E 18"x24" Blue/Red CPR Instruction Sign on Heavy Duty Aluminum is printed on heavy-duty aluminum material and is designed to instruct patrons how to perform CPR. Our CPR Instructions are kept up-to-date with the American Heart Association Standards and Guidelines. Our general information signs are very noticeable and used to inform people of facility restrictions, policy, object location or instruction. This sign is lightweight, durable, and waterproof for indoor or outdoor use.