Ive been using Fins for a while, mostly the Original PRT.
This new 40G stuff is meant to have greater breaking strains than suggested. (the 15lb they state break at 22lb).
Just spooled up a Luvias 3012H with almost 230m of Braid. As generally LB fisho- then having greater castability is always favorable.
The 15lb is thinner than the original 6lb.
No wind knots yet.
I think its a great product and so far so good, and worth considering on your next respool.
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