With a spinner, you can use any coil from 1.5-2.5ohms. Lower ohms=less voltage needed to heat up the coils. I like the 1.5 or 1.8 coils, personally. Say you're using 1.8ohm coils, you'd set your voltage around 3.8, depending on your taste. Some people start on low voltage, and twist it up until they start tasting a little bit of burnt, and then dial it back. The VV devices really take the math out of it.