These are specialized hooks that are designed to be used in conjunction with a variety of materials such as feathers, fur, and thread to create a wide range of fly patterns. Fly tying hooks are typically made from high-quality steel and are available in a wide range of sizes, shapes, and styles to suit different fly tying applications.

Fly tying hooks are classified by their hook size - the larger the hook size, the smaller the hook. For example, a size 16 hook is smaller than a size 12 hook. Fly tying hooks are also classified by their shape, with common shapes including straight, curved, and bent. The shape of the hook can affect the way the fly behaves in the water and can be chosen to suit different fly patterns and fishing situations.