Poly-Tech offers cleaners, conversion coatings, passivates for coil coating lines, cold rolled steel, galvanized steel.

我们提供清洗、转化成膜、钝化等产品和技术，应用于冷轧钢卷、镀锌钢卷、彩涂钢卷等钢材加工行业。

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It's these high-tech poly strings that allow pros to swing for the fences and have the balls drop in because of the bite and hyper topspin the strings generate.

WSJ: Roger Federer: With Tennis Rackets, He Strings Them Loose