I use these on all of my BF mech mods. Dual coil, 26g Nichrome 80, 8 or 9 wraps each depending on juice. Comes out to roughly 0.3~0.45 ohms, and they work perfectly for me on my Reos and Dibi mods. 12 wraps each of the same wire on my regulated squonker is gorgeous at around 35 watts.