Pack of single coils made by SMOK. These are replacement bottom coils that are made for the SmokTech bottom coil tanks. Bottom coil tanks and clearomizers provide a cooler vapour, with a superb clean flavor, and reduced wicking issues. This is due to the bottom coil design. These coils vape great and are versatile because they work with all Smok bottom coil tanks and clearomizers including but not limited to the ARO and Pyrex ARO II, the Trophy tank, the RBC tank, Mini Protank, Protank II and Mini Protank II.