The Proton Power is an older head from STX but is still one of the best selling head of all time. It has a long list of great players that have and do use it. It features one of the most pinched face shapes and a very long narrow throat. This makes the head ideal for attack or midfield. It is a NHFS head and its older brother, the Super Power, is the X spec version.
STX Proton Power Full Review
STX Proton Power Mid Pocket w/ Pattern 15mm East Coast Mesh
STX Proton Power Mid Pocket 15mm East Coast Mesh Includes Pattern