In about 1978 these hooks were very carefully developed with Vince Marinaro as the almost perfect hook for small dry fly patterns.
They were offset because Vince felt that they hooked better, and they had a down turned eye which he felt allowed him to move the fly on the water in the right way.
He strongly recommended tying them on with a turle knot which he believed did not lengthen the fly.
They have a Bronze finish and a wide gape.