These proprietary probes are specific to Neurotris.  They have 4 long prongs that allow for 8 contact points which look a little like a fork.  These pico probes are special as they deliver a larger contact to the face allowing better results and delivery. The Neurotris device utilizes these probes along with a patented impedance technology which allows the best treatment possible. More contact points and less disruption of the current which equals amazing results!