Umpqua offers the serious fly tier a value-based hook alternative to the current offerings on the market, with a broad range of the most desirable hook styles. After extensive product research, they deliver a quality product at a terrific price. Umpqua U-series hooks feature high-grade carbon steel, chemically sharpened points, micro barbs for easy penetration, and easy de-barbing, along with a logical numbering system for hook use identification.U-Series Numbering System:U0xx - Dry Fly HooksU1xx - Nymph HooksU2xx - Curved HooksU3xx - Streamer HooksU4xx - Saltwater Hooks U5xx - Specialty HooksThe U503 is great for Salmon/Steelhead.