Stimulators get the call for so many situations it's hard to know where to start. They serve well to imitate various hatches but are probably most used as an attractor dry fly while searching for active fish looking for a big meal. Every angler should have an assortment of Stimulators in various sizes and colors. The Olive Stimulator is a good choice for imitating big Traveling Sedge and can be a good attractor color when caddis are dancing about. Size 8 pictured.