When our Tennis Warehouse Australia play testers were given samples to test, we were really impressed with the spin we could achieve. This string uses a uniquely refined co-polymer polyester with a soft molecular construction which provides maximum control. We noticed! This is definitely a string for an advanced player who is looking for control for pin point accuracy. But what we also liked was that Head have managed to add more touch and feel by using a 'temper process'. We were really impressed with this string and believe you will be too!