Just buy a cotton on local vape store and they are give IGO W RDA as a free give. Build it with 26g khantal , 2,5mm, 7 wrap, came out as 0.40 ohm on dual coil. Put a Screwbaco Menthol liquid and .... BOOMM this is what I am looking... OUT STANDING MTL..., Extremely very good flavor because the airhole is so small and make a perfect MTL RDA. On my opinion, dual coil make a flavor beat almost all my atty (Hadaly, Narda,Hobo V4,Derringer,O Atty). Very2 suprising and really tight just like cigarettes draw. Perfect company for drinking coffee. Really hope there is IGO W RDA next generation with all same design, shorter cap, bottom feed pin for squonk and with two post. This RDA is a legend. If your local store still have it, buy it!!! You wont regret it.