One micro coil (.3mm A1 Kanth, 8 wraps, 1.5ohm) across, two slim pieces of wool *inside* the same coil (ie. using all 4 channels), the rest like before - and it's awesome! Seriously, way better than anything I've tried. Really good vapor, strong flavor, no dry or burnt hits... in-cre-di-ble. Perfect on my mech!