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Wilson Enduro Pro 16 660 : Polyester. Wilson Enduro Pro 16 offers unprecedented power and control. This high performance string was designed for competition tennis.Enduro Pro 16 is Wilson's answer to the polyester revolution. This string offers excellent durability and actually plays a bit on the lively side for polyester. Enduro is a great choice for string-breakers and also works well for hybrid string jobs. *This reel can string about 17 racquets.