All A1 Kanthal, 6 wraps around a .133 drill bit. 0.143 ohms. Barely but perfectly fits in my mad hatter with .084" side holes drilled, aimed downwards at about 45 degrees. Huge clouds and perfect flavor, flavor is up there with a standard Clapton, but the wattage is less and ramp up is less and clouds are bigger. BTW I am not sure where the sweet spot is I just made these, but I'm going between 115-130 watts. It's my favorite coil so far and I've made quite a few. I started with a Vuse, then a Kanger Protank that I starting building coils in, lol. And then I got a Panzer Blackhawk clone, a good one. Built with it down to .08 and it was time to get something safer so I got a Koopor plus. It works awesome, It has planty of power. I need a larger deck to build on for 200 watts though. So enough rambling lol. I'll get pics, but if you like clouds and want good flavor too try this build.