TECHNIFIBRE BLACK CODE 16G BLACK REEL 200MTecnifibre Black Code 16(1. 28mm) is Tecnifibre's first geometric string offering durability and increased spin. Utilizing a co polyester core, this string possesses excellent durability with greatly enhanced tension maintenance and feel. Black Code 16 features a pentagonal profile, helpful for generating more spin as the string bites into the ball better. The string uses Tecnifibre's exclusive ThermoCore technology which serves two primary purposes.