This pattern is tied on a straight shanked hook, size 12 here. The trailing material is mylar tinsel for movement and flash in the upper strata. The body is a wound dubbing brush, but of course you could dub a similar body, in olive. The wing is a couple of stacked CDC feathers. This pattern has done very well on rivers and lakes as a diving/emerging caddis imitation. This would be an equally good pattern without the bead and fished below the surface or in the film.