These coils are specifically designed for the CL Tank by KangerTech. The CLOCC coils are built using organic cotton and a stainless steel construction. These coils also have the function to be used in either wattage mode or temperature control mode on devices that offer the TC function. The reccomended wattage of the CLOCC 0.5ohm coils is 15-40 watts. These coils come in a pack of 5.