Freeze Branders kill pigment cells in the skin so that hair is permanently whitened where the brand was applied. The branding heads are super-cooled in either liquid nitrogen or dry ice and alcohol. Freeze-Branding Irons feature brass heads that are heavy enough to have good temperature-holding capacity so more animals can be branded in less time. 2-1/2" x 5/16" numerals sold in set of digits 0 through 8.0 through 8 (Use digit 6 for 9.)