Tecnifibre Black Code Reel 660' - OrangeTecnifibre Black Code Reel 660' Orange Tecnifibre Black Code is a pentagonal polyester string designed to have better elasticity, which delivers more pop, a bigger sweet spot and less shock at impact. The pentagonal shape increases spin and feel. ThermoCore technology, an innovation in the polyester string process, allows the reduction of shock and vibrations linked with the use of hard strings. Black Code is aimed at frequent string breakers and can