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Did you ever compare ToughGut 16 to 16L?A number of years ago I checked out the various natural gut options. I found that each had one negative or another.
However, once I found Pacific Tough Gut 16, I never looked back. It's been extremely consistent over the years in its playability, durability and tension holding. I string it in the mains with Gosen Micro 16 in the crosses.
Once I notice any type of fraying, I use the Babolat string savers. Note that I'm generally not a string breaker.
I just noticed that its not listed right now at TW. I hope this is just temporary. I still have a few sets left.
I have only used ToughGut 16L, as I feel that I might lose too much spin going to 16...