Are you looking for a replacement coil for your SmokTech TFV4 Tank? The Smok TFV4 design offers easy replacement with a single tube containing a patented vertical arrangement of coils. This arrangement and design provide excellent airflow and superior heat insulation. It comes with a 100% organic cotton wick. The patented design can run between 40 and 140 watts through the coils. You get 5 replacement coils to ensure you can vape when you want.