The 28 prong needle configuration consists of two rows of 14 needles set in a straight line. This needle is great for applying thick eyeliner (top only), soft and solid fills in sparse eyebrows, and for filling in lips. This needle comes in sterile packaging for one use. After one use needle is disposed of in a Sharp's container for easy and safe cleanup. This needle is the same as the 28 prong click tip needle except the comfort pen needle system comes in one piece: needle and handle together. The click tip needles must be inserted into a click stick handle.