A hair stacker is a tool used to align the tips of hair cut from a hide before attaching it to the fly. It is as simple as putting the fur into the brass tubing, placing the tube into the stacker, and gently tapping a tabletop with it a few times. Your hair will be aligned and ready to secure to your fly. Made of anodized aluminum and designed by Andy Renzetti and Pat Ehlers and madein the USA!