Zoo Meds Snake Strip™ Under Tank Heater fits 10 gallon & larger terrariums. Size: 3.5in x 18in Features: Perfect for snakes! Narrow strips are the preferred heater shape by snake keepers worldwide. Promotes Thermoregulation: Heats the rear portion of the habitat and creates the perfect thermal gradient! Effecient, Proven Design: Uses just 10 watts. Sticks directly to glass for optimum heat transfer.