Thread, tinsel, and wire are essential materials in fly tying for fly fishing. Thread is the primary material used to secure all other components to the hook and create the body of the fly. It comes in various colors and thicknesses to suit different patterns. Tinsel is a shiny, reflective material used to add flash and attract fish, often wrapped around the body or used for ribbing. Wire is a thin, flexible metal used for added durability, weight, and segmentation, enhancing the fly's realism and effectiveness in water.