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. 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.