5 Prong Straight: A great configuration for small details. 5's may be used for the tails and bulbs of small/thin eyebrows, adding wisps to hair strokes, or the very fine outlines of medium and thick eyeliner in the tail area.
 
Best for a thin upper or lower eyeliner. The bigger the number on the needle, the longer the line will be. Some feel more comfortable implanting a shorter line while others prefer the longer line that is created with the bigger numbered needles.

Using a 12 prong needle can be more than twice as fast as using a 5- prong needle.