The Vinyl Rib is great for segmented bodies on midges, stoneflies, nymphs, emergers and much more. This is the UTC MDG in chartreuse that I have tied on 3 different sizes to show how the segmentation will appear on different hook sizes. The Rib is slightly see-through and you get a nice effect if you wrap the hook with a different color to get a effect.
TMC 2488 #20
Knapek Midge Pupae #10
Here the Knapek is tied with a body of red UNI 8/0 body before wrapping the rib