Nautilus X Coils
It may be worth mentioning that it is considered by some to be the new best tank on the market.
The coil is made out of Kanthal wire with a build landing on 1.5 ohm. They use the new U-tech airflow design from Aspire. The design is made so that the air can flow from the top on one side and come out from the other side, thus the U letter being used.