Beast was also breaking quickly for me too. I can normally make a set of 17g competition or spiky shark last about 20 hours on my frames. I got two packs of 17g beast to test when it was released and they both broke quickly. My set broke within 2 hours, and the other set I strung for someone else, and it broke in a week. That person normally only has their racquet strung every 2-3 months.
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