510 Dual Coil - XXXXL (4XL) Cartomizer:
These produce great amounts of vapor due to the greater heating area of the dual coils but have less potential to burn due to the higher individual resistance of each coil. (They'll still burn if they run dry, so make sure to refill!)
These hold about 90-100 drops of e-liquid. New improved filler material is more absorbent.
NOTE: that these are not sutiable for eGo, 510, 901 or mosfet driven type batteries. These are meant to be used with 3.7 volt mods with a switch capable of handling 2 or more amps. Your results may vary and the protection circuits on some batteries at higher voltages may see these as a short and not work.