a string for good twist and acceleration. Even the name lets one suspect a lot of twist. The MSV Hepta-Twist assures maximum spin from every stroke. If one needed proof that tennis strings belong to rocket science, then the Hepta-Twist from Mauve verify this. Alone the vision of the seven sided axial twisted Co-polyester string ought to make every felt ball rotate! straight after the strike there is no stopping! Among spin strings Tennis magazine rated the Hepta-Twist winner as far as acceleration. (10/2014) Tie knots in your opponents legs with the MSV Hepta-Twist 12m anthracite. Highlights: a spin string for maximum power, speed and twist. High-Tech-Co-Polyester string. seven sided twisted structure. top rating on String forum de. Best acceleration and tension stability in the Tennis Magazine spin string test (10/2014)