To my knowledge, this is the smallest gauge needle
in existence for rooting doll hair. They literally do
not leave a visible hole and you really need very
fine quality mohair to make them work well. These
are not at all like the felting needles with barbs that
we are used to using. This needle has a tiny groove
down to the end of the needle which picks up
literally ONE hair at a time. They are quite strong,
despite their delicate appearance, and I rarely break
one.