The TFV8 Big Baby is just a slightly larger version of the TFV8 Baby. It uses the same coils, but different glass.
53mm high x 22mm diameter
V8 Baby T8- octuple coil .15 Ohm 50w-110w
V8 Baby X4- quad coil .15 Ohm 30w-70w
V8 Baby Q2- dual coil .60 Ohm 20w-50w
THE TFV8 AND TFV8 BABY COILS ARE NOT CROSS COMPATIBLE!