Babolat combines RPM Blast, one game's most iconic (and spin-friendly) polys, with RPM Soft, an ultra-comfortable polyamide (nylon) monofilament. As such, this combo offers a greater range of playability than is offered by a single-string type. Players looking for more control and durability should put RPM Blast in the mains. Players looking for more comfort and power should put RPM Soft in the mains