Sizes I offer, which should be mostly common and universe for most of anglers, are 20, 22, & 24. Also ask me how to rig-up and fish properly!! I will instruct you every details.
Goose Biot Midge: This is the staple among staples. Can't go wrong. CDC Wing is very visible and buoyant.
Foam Emerger Type 1: Combination of these materials are seriously deadly. I have caught many a selectively sipping trout. Just rub a tiny bit of oil-floatant on foam.
Foam Emerger Type 2: This is constructed with the same elements as Type 1 but in a different style. Selective trout can tell the difference and choose the style even in this size. So rotate between Type 1 and 2 and you will be OK!! Just rub a tiny bit of oil-floatant on foam.
See the stomach sample. This was only a tiny part of, well, "mound", really. Observe which is more prevalent than the other.
Price: $2.25 each