Color sections correspond to the nfpa hazardous materials code 704m. The color diamond is used with a numerical scale of 0-4 to indicate the health, fire, and instability of special chemicals. The bottom white section is used to show the specific hazard. "NFPA sign kit includes: * Diamond base available in aluminum, plastic and self adhesive vinyl * 3 sets of numbers 0 to 4 printed on clear, polyester, self-adhesive material * 6 specific hazard symbols printed on clear, polyester, self-adhesive material