I've just re-coiled a protank head for the first time with a micro coil and cotton, did about 8 raps, it tastes pretty good but it came out at 3.1ohms and i cant for the life of me remember if my kanthal is 28 or 32 gauge.
27AWG = 0.35mm (like a refillable pencil lead)
28AWG = 0.3 or 0.32mm
30AWG = 0.25mm
32AWG = 0.2mm
34AWG = 0.15mm (like a human hair)