Eleaf HW-N/HW-M Dual Coils are designed for ELLO series tank. Each of them has two cylinders inside, constructed of dual mesh coils. This design provides a much bigger surface area, allowing for better flavor and bigger clouds. Eleaf HW-N Dual coils features 0.25ohm resistance, Eleaf HW-M Dual coils features 0.2ohm resistance. Both of them will produce massive clouds and great taste.