Signum Pro Thunderstorm String Tennis With five sharp edges for

With five sharp edges for enhanced bite and a low-friction surface for vicious snapback

Hexonic Power also delivers power

Designed with the help of seasoned industry technicians and professional players the Blackout 300 is fast explosive and powerful

It was made with a new material

fast strokes

Signum Pro Thunderstorm String Tennis With five sharp edges forThunderstorm 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. Weve had fantastic feedback from this string, so we think this is necessary