A number (0-4) or an abbreviation is added to each square indicating the order of hazard severity. The higher the number, the greater the hazard. We have the quantity and drum label size that you need for your application. These pressure-sensitive paper and PVC-free vinyl safety labels meet the NFPA 704 standard, and are printed with light-fast inks and reliable adhesive, so you can be sure they will not fade or fall off.