Signum Pro Firestorm 17

The Signum Pro Firestorm is the perfect string for players looking for maximum durability and need more control into their game. It has an amazing spin-potential. If you strung it tight, you get excellent feel while still retaining impressive control. If you string it at the low end of the tension range, it gives you a balance between comfort levels, touch, and pop. -- quoted from Tennis Warehouse AU