Scientific Anglers Sonar Stillwater Seamless Density Sink 5 / Sink 7 Fly Line
The Scientific Anglers Sonar Stillwater Seamless Density Sink 5 / Sink 7 is the fastest sinking line in the Stillwater Seamless Density range, designed for getting flies down quickly and fishing close to the bottom. A Sink 5 running line transitions seamlessly into a Sink 7 head, creating a fast, controlled descent while maintaining direct contact with your flies.
- Sink 5 / Sink 7 blended-density sinking line
- Fastest sinking line in the Stillwater Seamless Density range
- Designed for fishing deep and dredging the bottom
- Seamless Density technology for a smooth transition between sink rates
- Helps eliminate hinging and maintain direct contact with the flies
- 45 ft head length
- Overweighted by two line sizes
- Textured hang markers at 10 ft and 20 ft from the tip
- AST Plus for improved shooting and durability
- SA Line ID
- Welded loops
- 100 ft total length
- Charcoal / Black colour
The Sink 5 / Sink 7 is built for reaching deep water quickly. The Sink 7 head drops at 7 inches per second, while the Sink 5 running line follows behind, making it particularly effective when you need to get your flies down and keep them fishing close to the bottom.
The Seamless Density construction smoothly blends the different densities through the line rather than creating an abrupt transition. This reduces hinging and creates a straighter connection between you and the flies, helping maintain contact and detect takes even when fishing deep.
The 45 ft head is two line sizes heavy, providing plenty of power for turning over teams of flies and larger streamers. Textured hang markers at 10 and 20 feet also provide a tactile reference as your flies approach the boat.
Who is this for?
Stillwater trout anglers fishing deep water or targeting fish holding close to the bottom. The Sink 5 / Sink 7 is the fastest option in the range and the choice when getting down quickly and staying deep is the priority.



