The String Library
Polyfibre
Polyfibre is a German co-polyester house known for soft, comfortable polys. TCS and Black Venom lead on comfort and feel; Tour Player and Panthera on control and durability; the Ribbed and Rough builds add spin.
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Monofilament
A single co-polyester strand. The modern control-and-spin string — firm, precise and durable, and what most competitive players use. It rewards a full swing and sits firmer on the arm than a multifilament.