The Scientific Anglers UST ST-6/7-S1S3S5 35ft BL Heron/Grey/Black is a 35-foot sinking tip fly line designed for 6/7 weight rods. Here’s what you need to know:
Key Features:
– UST (Ultra Shootable Taper) Technology – Optimized for long-distance casting with a smooth, aggressive taper.
– Sinking Tip Configuration (S1S3S5) – Features a 1-inch per second (S1) floating section followed by 3-inch (S3) and 5-inch (S5) sinking segments, allowing for versatile depth control.
– 35ft Sinking Head – The entire head sinks, making it ideal for streamers, deep nymphing, or saltwater applications.
– Color: Heron/Grey/Black – A muted, fish-friendly color scheme.
– “BL” likely stands for “Braided Loop” for easy leader attachment.
– “New Without Box” – The line is unused but may not include original packaging.
Best Uses:
– Streamer fishing (deep presentations)
– Saltwater fly fishing (striped bass, redfish, etc.)
– Stillwater trout fishing (leeches, nymphs, or baitfish patterns)
– Fast-moving water where a sinking line helps get flies down quickly.
Compatibility:

– Works best with 6 or 7-weight rods (check your rod’s recommended line weight).
– Pairs well with intermediate or full-sink leaders for deeper presentations.
Why Choose This Line?
– Precision depth control with multiple sink rates.
– Long-distance casting thanks to the UST taper.
– Durable coating for saltwater and heavy use.
If you’re targeting fish that require a sinking line, this is a great choice. Let me know if you need setup or rigging tips!