Great News ! Wismec’s first Drip Tank Hybrid with NotchCoil --- Theorem RTA NotchCoil Tank will be in stock soon ! Why Wismec Theorem RTA NotchCoil Atomizer is so popular ? As we know that the Theorem Atomizer is designed by JayBo, inspired by SMM. Featuring the new and exciting Stainless Steel NotchCoil. Theorem RTA NotchCoil Atomizer is the first tank to utilize an Open Wicking System, a combined Top Airflow Juice Plug and a Solid Leakproof Sleeve Design. It is quite accessible and easy to install by removing the glass sleeve from the deck exposes the build area . Removing the Top Airflow Cap simultaneously exposes the fill port, allowing the user to easily refill the tank without alerting their airflow settings.