This Cajun Red Ice Line is virtually invisible cold weather Fishing Line:

•Specially designed for ice fishing. Water filters out certain colors more quickly than others and red is the first color to be completely filtered at 12'. That's why it's visible for you but invisible to the fish under water
•Easy to use formula was created to stay fishable in subzero temperatures and be highly visible against the ice.

2lb Test - 110 Yard - .006 avg. dia. .152mm dia.
3lb Test - 110 Yard - .007 avg. dia. .178mm dia.
4lb Test - 110 Yard - .009 avg. dia. .228mm dia.
6lb Test - 110 Yard - .010 avg. dia. .254mm dia.
8lb Test - 110 Yard - .011 avg. dia. .279mm dia.