Check out these cheap deals for Smok Brit One B2 0.4ohm Coil.
These Smok B2 heads work in the range of 20 to 50 watts for huge vapor clouds and plenty of flavor. They are compatible with the Brit Mega Kit Tank. They feature a kanthal heating element, dual coils, 0.4ohm resistance and are said to produce excellent flavors. The recommended setting for this type of coil is 35 watts.