Tecnifibre ranges from its mildest co-poly to hot and red hot shading. This string is ideal for massive hitters who want precise control during full swings. Thermocore Technology, an assembly process that uses warming and cooling steps to relax the string, is partially responsible for the unique feel. Due in part to its five gripping edges, Dark Code also offers enormous turn potential. Players who are driven and moderate who want to attack the ball with fantastic strokes without suffering from overhitting should adore this string. It's a very good reward because it puts less strain on your arm than the standard poly.