Hooks, which are indispensable, vary in shape (the most common being straight and curved shanks) and size depending on the types of flies being tied. For fishing in rivers and streams, a range from size 12 to 20 will be more than sufficient.
Tying threads are used to secure materials to the hook to create fishing flies; they are made of both natural and synthetic fibers and come in various colors.
Tying materials deserve a separate mention. A wide variety of products are available on the market, ranging from classic natural fibers to increasingly innovative synthetic materials.
Among natural materials, the most commonly used feathers are: pheasant tail, partridge, goose, and cul de canard. They can be natural or dyed. Primary colors include tan, olive green, bronze, light and dark gray, and other decorative shades.
Rooster or hen neck feathers are also used, marketed as bird capes, which naturally include the feathers. They differ in color—which can be natural or dyed—and origin. Necks can come from common roosters or genetically selected ones, providing feathers better suited for fly tying. Costs and quality vary accordingly.
To begin tying, even the most economical capes in colors such as ginger, blue dun, gray, and red can be sufficient.
The most frequently used hairs are hare, llama, deer, or squirrel. These can also be in natural tones or dyed.
Among synthetic materials, polypropylene hanks, antron, or plastic yarns are the most popular. They are inexpensive, easy to find, and available in an infinite variety of colors.