The name says it all. The idea came when we tie a bunch of egg patterns for Steelhead fishing the Salmon River up state New York using the EP™ Tarantula Hairy Legs Brush. They performed very well but of course some colors where missing and at the same time needed some adjustments. I added a little extra mix of EP™ Fibers and EP™ Silky Fibers bled with EP™ Sparkle Crystal Blue in all the colors which it add a tremendous amount of UV light reflection. The result? A totally different egg pattern and that what these chromes like "DIFFERANTIALITY” 6 - Brushes per pack.