I've found that all factory coils for my TFV8's (I've got 2 TFV8 Big Baby Beast and 1 TFV8 Baby Beast, the smaller version) both use same coils, and on lazy days where I don't feel like rebuilding coils and installing in the RBA deck/coil I use the factory coils. Primarily the T6, X4 and the Q2 coils. All are amazing, great flavor, insane vapor production and they last a good few weeks. Check out the TFV8 BIG BABY Beast or the Baby beast (smaller version) not the regular TFV8 Cloud Beast those take different coils and aren't interchangeable.