Pack of 10 Labels. Place directly on storage tanks, processing tanks and vessels, feed hoppers, pipelines and other potentially hazardous equipment. Upper three corners of the signal rate health, fire and reactivity on a scale of 0 to 4. Lower corner gives specific hazard information. Ratings and symbols can easily be applied using our Gothic style Quik-Align½ numbers and letters (sold separately). All signals meet National Fire Protection Association's Code No. 704M and Federal Standard 313.