NFPA Adhesive Label Kit (Placard, Digits & Symbols) By SmartSign | 6" Square 3M Engineer Grade Reflective NFPA diamond, when measured from the top to bottom of the diamond, is actually 85" high (eg which is the same as the 6" square tilted by 45 degrees) Add your own ratings and NFPA special hazard symbol These digits and HazMat symbol pictograms are included Reflective NFPA signs use 3M reflective film (and not a lower cost / lower quality competitive product)