The Signum Pro Firestorm is the string of choice for Mikhail Youzhny, Sergiy Stakhovsky, Mikhall Kukushkin and Philip Petzschner.
ATP - Top - 500 - Pros playing with SIGNUM PRO ....
New optimized molecular structure
Outstanding Power
Excellent playability and comfort
Minimum tension loss
Excellent ball control
High durability
Firestorm is the perfect choice for the professionals and aggressive players. It also has a modern design.