10 tails per pack. Chuck Kraft has developed the most deadly hellgrammite pattern ever produced. Chuck has been developing this fly since 2007. The public release was January 24th, 2014 at the Fly Fishing Show in Somerset NJ. Don't let other "knock off" tails fool you. Our tail was tested, adjusted, tweaked, fished and fully developed over 6 years. When Chuck Kraft develops a fly........it is fully developed and perfected before it is released to the public.