These are the prebuilt coils for rebuildable dripping atomizers and rebuildable atomizers.
The coils are made of Kanthal with a diameter of 0.3mm, which is 28 gauge.
Kanthal is a ferritic iron-chromium-aluminium alloy (FeCrAl alloy) rated for use at temperatures up to 1400°C (2550°F).
The alloy has high resistivity and great oxidation resistance.
The factors that affect resistance are:
Diameter: The thinner the wire (higher gauge number), the higher the resistance per foot. The thicker the wire (lower gauge number), the lower the resistance.
Length: The longer the wire, the higher the overall resistance. The shorter the wire, the lower the overall resistance.
Temperature: The more heat the wire generates, the more resistance it will create.
Current: Determine the current (amperage) you need to heat your kanthal wire.
Size: Diameter 0.3mm