Coils designed exclusively for joyetech exceed electronic cigarettes.. pack of 5 1.2 ohm coils.. . mark. joytech. . features. suitable for: joyetech exceed. . definition of terms. tc (temperature control): direct definition of the resistance heating temperature.. . tcr (temperature coefficient of resistance): temperature control with customizable settings.. . vw (variable wattage): power adjusts according to the connected atomizer or its resistance.