J:son Hatch Pack are available in several versions and contains either 6, 8 or 12 flies. They cover the whole or the most important parts of many insects life cycles, including mayflies, caddisflies and stoneflies. A great gift to yourself or anyone else that takes fly fishing seriously.
Note that color and sizes vary based on species, location and geographic conditions. The same applies to mayfly hatching times. Some hatch early, others later; some hatch intensely for a short period, while others hatch over longer periods and in two rounds.