From Rapax:
“Paolo Pacchiarini’s wiggle tails are a great way of adding life-like action to your flies. It is a proven way of attracting predatory fish such as pike, bass, perch, large trout; you name it, and have resulted in many big catches throughout the world.
In this brief video I show you how to use “snaps for tails” and “snaps for hooks” to attach Pacchiarini’s wiggle tails to your hook.”
Both the snaps and wiggle tails shown in this video can be bought from https://www.rapaxflyfishing.com