Scientific Anglers Sonar Musky Fly Line monofilament What does this mean

What does this mean

contoured design that forms a surefire seal

Built-in stripping guard

5″ or 6" long

and with its intermediate density

Scientific Anglers Sonar Musky Fly Line monofilament What does this meanPOWERFUL FAST SINKING MUSKY TAPER Powerful head to turn over extremely large flies Reinforced loops Oversized running line for increased line management and positive strip sets. Intermediate running line and Sink 5 head works well for lakes and rivers For use in moderate climates Braided multifilament core SA SONAR MUSKY XXX GR (# = grain weight) SPECIFICATIONS LINE WEIGHT HEAD LENGTH TOTAL LENGTH GRAIN WEIGHT* 350 gr 8 9 wt 25. 0 7,6m 90. 0 27,4m