This is the newest Babolat string to the RPM Tennis String family. Because the strings are your racquet’s powerhouse, it is important to choose them well. We invented the 1875 tennis strings and have been constantly inventing ever since. Do your multifilament strings break too quickly? Are you looking for a monofilament that’s more comfortable for your arm? Check out our latest innovation that combines the best of both worlds. The new RPM SOFT polyamide monofilament is more durable than a multifilament and more comfortable than a polyester monofilament.