The MT3S is a new design from the First MT3. Kanger has intergrated the same design they currently use for their eVod & Protank. This Clearomizer holds 2.4 ML of e-liquid with replaceable coils from the bottom. The MT3S works on the Ego style batteries by using the ego cone threads instead of the 510 threads. To fill turn upside down unscrew and fill around the sides. To replace coil untwist the coil and replace. MT3S comes: 1- 2.4 Tank Assembly with non-removable tip 1- Coil Head 2.2 ohm +/- .2 ohm 1- MT3S/T3S base Ready to be filled with your favorite E-juice