Dr.Fish Circle Hooks are made with high carbon steel with a black nickel coating, durable and corrosion resistant. Suitable for freshwater and saltwater, great for catfish, bass ,snapper, walleye, pike, tuna, trout, salmon and other species. The Octopus hooks have sharp points and barbs, the bend in the hook point and in-line design allows the circle hook to normally only hook the fish's lip and lowers fish mortality, great for catch and release.