Scientific Anglers Frequency Full-Sink Fly Line features a fast sink rate between 3-5 ips that makes it especially effective for casting streamers for big fish or nymphing in still-water situations. Advanced Shooting Technology ensures continual line slickness that reduces friction as it moves through the guides, plus, the thin diameter cuts through wind to allow for long casts. Midlength head offers enhanced line control. Monofilament core. Welded loop. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.