Coils and 4-type hair
Dense, tight, and it shrinks — which is what makes guard numbers lie to you. You cut what looks like a 2 and it comes out a 1. The module covers the shrink factor, going up a guard to compensate, and why you cut against the grain on the sides but with it on top.
What the module covers
Shrinkage, guard compensation, grain direction, sponge and definition after the cut