These are 4 Pre-Built 28g Quad ka1 Core wire Fused Clapton Coils wrapped with 32 gauge ka1 kanthal wire. The Inner Diameter is 2.8mm. They are .30 ohms and come with 2 pads of Organic Koh Gen Do Japanese Cotton. With coils like this you need to follow proper battery safety. Please use at your own risk.
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