The RS Lyon co-poly string used by Robin Söderling is also available as a single string set. 12 meters which is well enough for one racket.
This is a premium string highly rated by the tennis community. Watch the play test on tenniswarehouse.com and check our Youtube channel to watch the Tennis Warehouse VLOG about this string.
"Currently we don´t sell online to your region but please take your time to visit our full site. RS Tennis is available in most part of the world. To buy RS please send an email to email@example.com and we will direct you to one of our partners that can help you further"
"This region is currently not available for purchase on rs-tennis.com. However, we would love to have you explore the other functions and continue your visit at RS Tennis"