It looks like you’re referencing a specific fly fishing product—likely CDC X16 Emerger flies in sizes 10–14, possibly with a free fly box included (Product 317). Here’s a breakdown of what this might entail and why it’s useful for fly anglers:

About CDC X16 Emergers:
– Pattern Type: Emergers imitate insects transitioning from nymph to adult (midges, mayflies, caddis), making them deadly during hatches.
– Key Features:
– CDC (Cul de Canard) Feathers: Naturally buoyant and lifelike movement in water.

Fly fishing EMERGERS tied with CDC X16 Flies + FREE FLYBOX Sizes 10-14 #317

– X16 Hook: A fine-wire, curved hook designed for emerger patterns (good for delicate presentations).
– Sizes 10–14: Covers small mayflies, midges, and caddis pupae.
– Fishability: Effective for trout, grayling, and other selective feeders in slow to moderate currents.

Why Buy This Set?
– Versatility: Works in rivers, lakes, and spring creeks.
– Free Fly Box: Handy for organization (check if it’s waterproof or compartmentalized).
– Match the Hatch: Ideal for sulfur, BWO, or midge hatches where emergers outshine dries.

Tips for Fishing CDC X16 Emergers:
1. Presentation: Fish them in the film or just below the surface with a slow retrieve or dead drift.
2. Rigging: Pair with a dry fly (dry-dropper) or a nymph rig.
3. CDC Care: Treat with floatant (paste for CDC) to maintain buoyancy.

Potential Considerations:
– Hook Quality: Verify if hooks are chemically sharpened for better penetration.
– Color Options: If available, olive, gray, or cream may match local insects.

If you’re looking to purchase, check reviews for durability or ask the seller about specific tying materials. Tight lines! 🎣

(Need help finding a retailer or tying instructions? Let me know!)