"Topspin is a modern type of polyester string that allows the strings to be very control-oriented but still maintain a high level of comfort for co-polyester strings (soft but controlled). Beyond that, the players and I were also very positively surprised by the durability of the strings on clay, which is an important factor for the competitive players who really enjoyed playing with Topspin. But the strings were also popular with the intermediate players, although at a lower tension." / Davve, Roland Garros Stringer