A series of sinking lines that feature an increase in density at the front to ensure the line sinks tip first - aiding in bite detection and in setting the hook. These lines are made on a supple core for memory free performance and have a super smooth, tungsten impregnated coating that makes distance casting easy.  An essential line for the serious lake fly fisher.
The WF4S and WF5S, Type 6 lines are made on a Powerflex core.
 

Deep 3: WF4S to WF8S ~ 3-4 inches per second
Deep 4: WF4S to WF8S ~ 4-5 inches per second
Deep 6: WF4S to WF9S ~ 6-7 inches per second
 

Length: 90 ft (27.4m)
Color: Black and brown