I think I recall what your talking about. If I'm correct the hook is rather large and the head is covered in Softex or epoxy. I never fished them, but I did see them in some of the shops and heard there effective for silvers and kings.
I'll check some references tonight and see what I can find.
Try the "Alaska Fly Fishers" WWW page, they have a great archive of flies. I think this is the link, if not just google it.