It looks like you’re referencing FFS Fly Fishing Strike Indicators, which are popular among anglers for nymphing. Here’s a quick breakdown of what you might want to know:
Key Features of FFS Strike Indicators:

– Highly Visible – Bright colors (often orange, pink, or yellow) for easy tracking in moving water.
– Buoyant & Adjustable – Made from foam or similar material to stay afloat and slide easily on the leader for depth adjustments.
– Sensitive – Designed to detect subtle strikes when nymphing.
– 6 per Tub – Convenient packaging for multiple rigs or replacements.
Why Use Them?
– Ideal for euro-nymphing or tight-line techniques.
– Less splash than putty or yarn indicators, reducing spooking of fish.
– Reusable and durable compared to some other strike indicators.
Potential Considerations:
– Some anglers prefer smaller indicators for delicate presentations.
– May not be as effective in very fast or heavy currents compared to larger bobber-style indicators.
If you’re nymphing in rivers or still water, these are a solid choice. Would you like recommendations for rigging or alternatives?