SmartSign High Intensity Grade Reflective NFPA Adhesive Label Kit, "NFPA Sign", 34" tall diamond (point to point), Black/Blue/Red/Yellow on White NFPA diamond, when measured from the top to bottom of the diamond, is actually 339" high (eg which is the same as the 24" square tilted by 45 degrees) Digits and symbols are included and are easy to attach to the NFPA sign blank Digits are self-aligning Reflective NFPA signs use 3M reflective film (and not a lower cost / lower quality competitive product)