If you mean the product sold under the same name (Mayfly Spinner Wing Material), it is awesome - some gent out there sells ultra- thin foam (the stuff they line the USA air-mail letter- envelopes with) as "Mayfly Spinner Wing Material".
Personally, for < sz.18 flies (size 18 or smaller for fishing, to reduce the chances of leader twist, or any size fly if only for display), I etch into transparancy with a [bastard- file sharpened nail], then run a permanent marker over the ENTIRE wing (not the entire sheet, obviously), then promptly run a paper towel over the ENTIRE thing. With any luck, you have dark veins where the etching is/was, and a very- pale, almost clear wing between them of the same color. There are some brands or transparency that are thicker than others, and I use the thinnest I can find. For > Sz. 18 flies, I usually use a foam of some sort, though I like Stallcup's Medallion Sheeting. Unfortunately, it's too costly for my tastes... the way I lose hooks to the "Killer Rockfish" under the surface... (to those not familiar with the "Killer Rockfish" legend, it is a fancy fisherman's lie to cover up losing hooks in the bottom of a streambed, hence the ROCK- fish). If I want to go fancy or "more natural/ less synthetic", I'll always use Hen Hackle tips per Byard's suggestion. I'm almost out of one that I *think* I bought from him at a NJ show, along with a dun neck I *know* I bought from him... so next pay (if any are left!) I'll have to pick up one or two winger capes with a medium dun neck. They ROCK! Tight wraps, Pete
