THESE ARE SOLD AS SINGLE UNITS:
These replacement coils work well in the Protank 3, Mini Protank 3, AeroTank, Aerotank Mega, Aerotank Mini. These coils also work in any Kanger Tank designed for the Kanger Type 2 (Stacked Dual Coil) replacement coils.
This is the replacement coil from Kanger. It's dual coil, and designed to taste and work great.