Book a guide trip on the Yellowstone River, Paradise Valley Spring Creeks or YNP. Learn More

Shop our favorite Fly Rod packages Learn more

New collections added! Learn more

Scientific Anglers Sonar Sink 30 Warm Fly Line

$99.95 USD
Shipping calculated at checkout.


Scientific Anglers Sonar Sink 30 Warm, What's the most difficult part about throwing streamers? Actually throwing streamers. Casting a sinking line with a weighted fly has never been easy, but Sci Anglers SONAR Sink 30 offers you one of the most castable sinking fly lines we've ever created. Get down fast with the 30′ sinking head without fearing for your life while casting.
  • 30' extra-fast sinking head with handling line for better casting and control
  • Intermediate running line with ST+ slickness additive
  • High durability and low tangling
  • For temperate climates
  • Super Fast Sink: 4.0 ‚Äì 8.0 ips, sinks 4' ‚Äì 15'
  • Replaces Mastery Streamer Express
  • Braided multifilament core
  • SA ID ‚Äì SA SONAR SINK 30
  • WF-350-S 8Wt -10Wt Head Length 20.0/9,1m Total length 105'/32,0m 350gr./22,7g
  • WF-250-S 6Wt -8Wt Head Length 20.0/9,1m Total length 105'/32,0m 250gr./22,7g

Fully-featured with a comfortable price tag describes Scientific Anglers Mastery Fly Lines.   These lines can cover most any fly-fishing situation from saltwater flats to steelhead and salmon waters, plus everything in between.  Even a special design for competitive casting comes under this heading.  Mastery Fly Lines offer a number of advanced qualities starting with SA ID for easy line identification.  The AST additive provides slickness and durability, while Welded Loops allow easy change of leaders and attachment of backing.

As with all Scientific Anglers lines, Mastery Fly Line cores and coatings are adjusted for top performance within their stated temperature range.  No more limp spaghetti when it is hot or coiled springs in cold weather.   Special line tapers work to give an angler the best in line turnover and fly presentation, which translates into more fish caught.  Mastery Fly Lines are offered in a full range of sizes from 2-wt. to 12-wt. in a variety of tapers to maximize on-the-water performance and enjoyment.

Euro nymph lines are an important addition to the Mastery Line collection.  New for this year is the Euro Tactical Nymph Braided Core Line.  This line eliminates sag and gives a more direct connection to the fly.  This is available in a level line for tightline nymphing and a unique double taper version to fish dry flies.  It features AST and Welded Loops along with a bright orange front taper to help track flies.  All Mastery Fly Lines combine the best in value and performance across the fly fishing spectrum.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Venmo
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.