Scientific Anglers Micro Swivels prevent twist with large air resistant flies like poppers and streamers. Especially streamers with odd tails and wings. We also use these with some of our tight line nymphing rigs.
10 Micro Swivels per pack, available in three sizes x-small-25lbs test, small-40lbs test, and 80lbs- large. Swivels have a black finish to minimize flash.