It looks like you’re referring to a specific fly fishing product: “Ally’s Shrimp Yellow Double” in sizes 4鈥?0, sold in a pack of 8 (160).

Key Details:
– Pattern: Ally’s Shrimp (a classic salmon/sea trout fly)

Fly Fishing Salmon Flies Allys Shrimp Yellow Double Sizes 4-10 Pack 8 #160

– Color: Yellow (likely with some red/orange and flash)
– Hook Type: Double hook (common in traditional salmon flies)
– Sizes: 4, 6, 8, 10 (smaller sizes for low water/grilse)
– Pack Quantity: 8 flies

When & How to Use:
– Target Fish: Atlantic salmon, sea trout, steelhead (depending on location)
– Conditions: Effective in medium to low water, often fished on a floating or intermediate line.
– Retrieve: Slow, steady strips or a “figure-8” retrieve to imitate a shrimp/crustacean.

Similar Flies:
– Cascade (similar shrimp profile)
– Willie Gunn (another shrimp-style pattern)
– Sunray Shadow (for more aggressive takes)

If you’re looking to purchase or need tying instructions, let me know! Tight lines! 馃帲