Zilla Under Tank Reptile HeaterOur Zilla Under Tank Reptile Heater is an ideal heat source for desert and tropical species of reptiles, amphibian and arachnids. Reptiles rely on external heat sources to elevate their body temperature. They absorb warmth from their surrounding environment in order to maintain and thermo-regulate heat used for daily activities, appetite and digestion. Easy to use adhesive allows for secure mounting either under or on the side of your pet reptiles tank. The Zilla Under Tank Reptile Heaters are relatively flat, terrarium heat mats that are convenient and easy to use. Rubber spacers are provided for under tank mounting so that the weight of your tank or terrarium doesn't sit directly on top of the reptile heater mat.