This needle is the finer sister to the 14 curve and is used for finer, sharper eyebrow hairs. It is one of the most popular choices for both microblading and tapped hair strokes.
Like the 14, which was introduced at the same time, the 16 was originally used only for tapping--both for shading and for tapped hair strokes. Now it is also used for microblading with beautiful results.
