There is not a fish that swims in Lake Ontario that will break #20 Seaguar floro as long as its matched with a quality rod n reel. IMO.. I personally never use anything for kings heavier that #20 for all spoon applications and #12 to #15 for the majority of the season. #30 mono straight to a flasher/fly but thats it. I know you will have a higher hook up rate going as light as possible when presenting a properly tuned spoon... That includes terminal tackle as well. The more action the better. but thats me....