These have made tying patterns like the Angel Fly (Coffee's Sparkle Minnow) and the Bart-O Minnow a breeze.  Pre-made dubbing loops of angel hair eliminate the need for timely dubbing loops.  These are a great value for the time savings.  Tie in the end and wrap like a hackle up the shank and you are done.  Each pack come with 6 11" brushes.