RPM Blast 17 RPM Soft 16 Hybrid Tennis String combines the classic control and spin friendly RPM Blast with the softer and more comfortable RPM Soft. This hybrid will offer greater durability than the popular RPM/XCEL hybrid, but will play with greater comfort than RPM blast alone.

 Construction: RPM Blast  (Black)- Extruded co-polyester monofilament

                          RPM Soft (Grey) - Solid Core Co-Polyamide inner Layer | Co-Polyamide and Aramid Powder Middle Layer | Co-Polyamide and Silicone outer layer

Gauge: RPM Blast (1.25 mm / 17 g) RPM Soft (1.30mm / 16 g)