When you need big flies for big predator fish such as GTS, Pike, Musky, Dorado, and Arapaima, theEPPREDATOR BRUSHis just what you want. This brush is a dense mixture ofEPFIBERSwith the addition ofEPTHUNDERSTRUCK UV SPARKLEthat will push plenty water to attract those predator fish. Remember; the more wraps around the hook the more dense and compact the fly will be.