They were orginally the "other" head that Harry Elburg made... the primary one being the grizzly...
Harry sold the grizzly and wolverine line to a fellow by the name of Jim Able in Fairland, IN... Jim made the heads a while (early 90's) and then had a fire at his business and he sold the line to Shawn Schoonver who was from Pennsylvania I believe...
Shawn has since sold the "grizzly" line to Bill Dunn of Zipper Bows in Ohio...
Good heads... only knock I've heard against them is that the tip wants to curl on occasion as the ferrule doesn't go all the way to the tip...
Jonathan