M Pro 2 is an updated successor of the reputable M Pro tank. It is still slide-to-open top fill design, but is added with 3 steel balls to increase the friction when slide to open the top cap. A new series coils comes with the tank - 904L M1, M2, M3, and M4 mesh coils. The coil tech is also updated to FM COILTECH4.0 with military-grade SS904L mesh material and tea fiber cotton for more stable vaping experience and refreshflavors.