Stonefly nymph Mix Pack'sHere is a pack of awesome Stu's Superior Stone fly nymph fly designs. You get a custom selection of black and olive and sizes from 10 and 6. The larger super, heavy Gorilla nymph sinks like a brick, one of the heaviest nymphs we sell, perfect for that deep pool where a monster trout sits on the bottom munching, A fly that rides hook upright. Stu's fly designs are all tied on the best, strongest TMC fly hooks. Remember, Having more than one good fly