The String Library
Kirschbaum
Kirschbaum's co-polyester range — the soft Pro Line comfort polys, the firm Max Power and SuperSmash control strings, and the shaped Black Shark and Helix for spin. A poly-only German brand with a loyal following among stringers.
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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.