This is really my version of a woolly worm. Works best for trout in size 14 and 12 (same size is also a killer bream fly). Go bigger bass and catfish. Size 4 works well on salmon. It is a good all around nymph - won't work all the time but works most of the time.
Nymph hook
Gold beadhead
Black thread
Salmon Roe Egg Glow (Divide in 1/3 for trout size hooks - Too big as it comes from package)
Black Chennelle - micro size for trout
Black hackle