The SL12S is a beast of a big game fly hook, it is extremely strong. The larger sizes are meant for handling big game species like GT's, Tuna, Billfish, Shark, and big Tarpon. This is the hook of choice for tying large "Beast Fleyes" and other patterns for specifically targeting large fish. The smaller sizes are great for standard saltwater patterns for bonefish, permit, stripers, redfish, and many other species.