Signum Pro Thunderstorm String

Thunderstorm is one of our best-selling strings branded by Signum Pro and featured as X-treme Power. It was made with a new material, with ten sides axially twisted to produce Effects on the ball. This string is a favorite amongst many Players using Signum Pro; it has incredible Spin Potential, excellent durability, significant tension maintenance, and a feeling worth trying. We´ve had fantastic feedback from this string, so we think this is necessary for any Tennis Enthusiast.