Reptiles rely on external heat sources to elevate their body temperature. Zilla Heat Mat Terrarium Heaters provide warmth for reptiles to absorb from their surrounding environment in order to thermo-regulate heat used for appetite, metabolism and overall health. Carbon fiber heating technology efficiently radiates infrared waves creating uniform heating with no hot spots. Carbon fiber is an energy-efficient method for heating with no wires that might become pinched or broken. Material self regulates and reaches a temperature of 113-degree F. Each unit has adhesive backing and is low voltage with an internal shut-off switch for safety. Measures 6 x 8 inch, ideal terrarium size is 10-20 gallons.