The 3 Micro Needle is made from very fine gauge needles which are "flexible". Used for fine lines like brow hairstrokes and when you need to get into small, critical spaces. Make sure you use the needles at the proper angle or you can easily overwork the skin and get poor and uneven color retention. Unlike the NC 3 Power Needle, which is soldered very close to the tips of the needles and very rigid, the "3 Micro" flexes and has more spring. Not good for shading, these very long tapered needles make the tiniest holes in the skin and do not deliver as much color as the 3 Liner. This is a popular needle, however.