These coils are compatible with the following range from Innokin:They are NOT compatible with the Zenith RTA..Specs:0.8ohm: 14 - 17W (MTL)1.6ohm: 10 - 14W (MTL)Innokin - Zenith Z-Coil Replacement Coil 5pk$24.99PriceQuantity*Add to CartBuy Now