Are you looking for a spin friendly monofilament string that is comfortable? Babolat RPM Soft tennis string polyamide monofilament is more durable than a multifilament and more comfortable than a polyester string. Great for players who want to generate spin but don’t need the durability and stiffness of polyester string. Your strings are the engine of your racquet. Half of your racquet’s performance comes from your strings. Which means choosing the right string is important. We invented tennis string in 1875. And we’ve been innovating ever since, so you can play your best and enjoy the game more than ever.