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Materials.

Materials in tennis strings and racquets affect durability, spin, and power. Compare polyester, nylon, and graphite with test breakdowns and reviews.

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Gear ·7 min · July 2026

600D Is Not a Durability Rating: A Product Review of the Numbers on Tennis Backpacks

600. That is the number doing most of the work on the spec sheet of nearly every tennis backpack sold between roughly $80 and $200, and it is the number this product review is actually about.