A B.C. stillwater pattern; about as simple as they come. Original called for medium wire rib; the doubled/twisted small size is about the same thickness and a lot more flexible.

hook - Dai Riki 280 #8
underbody - non-tox .030
thread - Danville 6/0 brown
rib - small wire gold (doubled/twisted)
body - Arizona Synthetic peacock
legs - pheasant tail
head - peacock herl