Density Compensated Full Sinking Fly Line DC tapered sinking fly lines are easier to cast than traditional level sinking lines. RIO's manufacturing process enables smoother casting and uniform sink rates. In density compensated sinking lines, the sink rate of the tip equals the sink rate of the midsection, which allows the tip to sink first and put the fly in the strike zone. For all fishing conditions. Tungsten coldwater coating. Type 2, 3 & 4 WF4S - WF8S Type 6 WF4S - WF5S (Powerflex core) WF6S - WF9S (braided multifilament core) Colors: Brown and Black