These are all the coil sizes for 28 gauge prebuilt coils. They range from an Inner Diameter (ID) of 2.0mm to 3.0mm. The Inner Diameter is the size of the coil. 2mm is considered to be a Micro Coil. 3.0mm is a fairly large coil. Keep this in mind when ordering. These Kits include 10 prebuilt a1 Kanthal Coils and 2 pads of Koh Gen Do Japanese Cotton. When dealing with the coils that are sub-ohm (less the 1.0ohm) Make sure you follow proper battery safety. Please use at your own risk.
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