The Mantis Power synthetic tennis string is best suited to power players. Its monofilament is compressed to provide a durable core; the outer layers are twisted with very thin, elastic monofilaments to increase the sturdiness of the string. Thanks to the elastic resin bonding process, the string has optimum elasticity & power. It has a gauge of 1.25mm & is supplied in a 12m set, which is enough for one restringing.