Take control of every shot with Head Gravity. The secret of Gravity Hybrid String that sets it apart from the rest of the Head strings, lies within the unique combination of triangular main strings and round cross strings. At ball impact, the sharp edged main strings distinctive shape allows for maximum bite on the ball, while the round and then shaped cross strings provide a fast snap back effect. The result faster ball rotation so you can get more of the winning combination of spin and full trajectory control at the same time. In other words adding maximum spin to your game has never been easier and controllable.