First Alphaline is bulk poly, not a blend. It is one of the best bulk polys though.
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I dont like string bounce, I pre stretch all my strings. I find a string that has been stretched holds its shape and torsion better.
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I pre stretch my strings so stretch from play is always minimal.
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I pull fairy hard from the ends for 15-20 seconds. I dont want to feel “real” stretching, but I am applying a good amount of force. If you have extra string to ruin, pull really hard and you’ll notice the difference between a correct prestretch and the string seriously elongating due to damage.
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I find my prestretch routine adds 3-4 inches to the string, and that is consistent between my two favorite strings: Alphaline and Kitty First Class Fat (primary)