The Eleaf EC Coils are for the Eleaf Melo 1, 2 and 3, ELeaf iJust 2 and can also be used with the Aspire Triton atomizers. These coils are very popular because of their quality, design and price. The Eleaf EC Coils feature large wicking holes, and a heating wire of 0.4 mm in diameter to create large amounts of vapor and flavor production, moreover the Eleaf EC Coils uses 100% organic cotton for a pure flavor.