I have to disagree with Jigman based on my personal experience. A spook I make casts equally as well as my pencil and absolutely slays fish equally, if not better, than my pencils. Aerodynamic is the key as Jigman said. Jigman, I have never fished the famous JigSmith but many of my friends have.....I know that sucker is a fish slayer but I would imagine it must cast very well??
