The Smok V8 X Baby coils have been designed for use in the Smok TFV8 X Baby tank. Smok TFV8 X Baby tank. Not compatible with the SMOK Baby Tank or Big Baby Tank. T6 – 0.2 Ohm Sextuple Coils (Massive Vapour & unique flavour 40-110W – Best: 70-90W).