Fly Line Scientific Anglers Frequency Sink 23 Float/Sink 4

The Scientific Anglers Frequency Sink 23 Float / Sink 4 is a floating fly line with a sinking tip, specifically designed for fishing Booby flies and other buoyant patterns. Unlike fully sinking lines, it provides easy casting and handling while wading, making it ideal for shallow rivers and streams where a fully sinking line can be cumbersome to cast once retrieved.

The sinking portion of the line is long and heavy enough to reach the correct depth quickly, while still allowing smooth, powerful casts to efficiently fish drop-offs, seams, and deeper sections. The floating running line remains manageable and responsive throughout the cast and retrieve, ensuring precise control of the fly presentation.

For anglers seeking even greater depth, the line can be used with a sinking poly leader, enhancing its versatility in deeper runs or pockets. Part of the Frequency line series, this model combines high performance and affordability, making it suitable for both recreational and more advanced fly fishers.

Key Features

• Floating fly line with sinking tip (Sink 4)

• Designed primarily for Booby flies and similar floating patterns

• Easy casting and handling while wading

• Sinking section quickly reaches the desired depth

• Can be paired with a sinking poly leader for extra depth

• Excellent price-to-performance ratio within the Frequency series

Ideal Use

• Fishing rivers, streams, and stillwater areas

• Targeting drop-offs, seams, and deeper water sections

• Using Booby flies or other floating patterns

• Situations where a fully sinking line would be cumbersome