Volkl V-Square string is the most spin friendly string I have ever used. The square shape really bites the ball and makes it easy to generate lots of RPMs on my shots. It is a softer polyester string so it retains really good comfort. That softness also produces nice ball pocketing so that when combined with the easy spin, I feel like I can put the ball anywhere I want. As with most polyester strings it doesn't have a ton of power so it is definitely best for big hitting intermediate to advanced players looking to take their spin to the next level.