Our preferred and most popular brand is Signum Pro as we've found that not only are their strings manufactured to an extremely high quality level they perform better than all other polyester based strings. "Unbelievable Tension Maintenance" was typical feedback. Available now in 3 gauges - 1.18 very thin designed for ultimate spin and power, the 1.23 is slightly more durable but still with great feel whilst the 1.28 has the added durability that top players are after. Most of our players at the Queensland Tennis School Of Exellence rely on Poly Plasma week in week out.