The top pic is close cropped 4b hair. The bottom is Deeckay's longer 4b hair.

4b-LI dense hair tends to feel coarse if strands are wide.
4b-LI fine diameter hair tends to feel cottony and slightly rough.
4b-LI wide strand diameter tends to feel wiry and coarse.

4b-LI hair is the most fragile because of zig zag angles of the hair strands.  The smaller the zig zags, the more shrinkage is expected.  4b-LI normally doesn't shrink as much as a similar pattern siz
e 4a.

4b-LI does not reflect light easily so it doesn't have a natural shine.  It tends to straighten easily with heat but may flatten out before puffing out in humidity.  It will shrink upwards and inwards when drenched.

4b-LI tends to grow outward and sit downward once it has length.  4b-LI may be a combination of very small, tight coils and zig zags.  4b-LI does not have coil definition so may look fuzzy at the ends.

It holds wet twists & coils but may need to be re-done more often than 4a to hold.  This hair type has a tendency towards dryness and needs extra moisturizing to maintain softness.

Boar or natural bristle brushes are good for this hair type to achieve a sleek look and distribute natural oils while still being gentle on the hair.

Because of the zig zags and tight coils, this hair type is perfect for locking quickly.