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Continuing the popularity of EC coils, the upgraded EC2 coils will work well with your Melo 4 Tank. There are two different options. You may purchase the EC2 0.3ohm version that has a wattage range of 30 to 80 watts. Or, get the 0.5ohm one that fires in the range of 30 to 100 watts. Both options measure 12mm x 27mm, weigh 5.4 grams, are built with a kanthal heating element, and utilize organic cotton for health and pure flavor production.