TECNIFIBRE X-ONE BIPHASE REDTecnifibre's X One Biphase uses a heating process (H2C) which increases the cohesion between molecules allowing this string to have excellent power and exceptional feel. Their patented Biphase process extends string life by up to 20% and provides enhanced spin. Tecnifibre X One Biphase has been a best selling multifilament for years and continues to be an industry leader for players that want comfort and power. Tecnifibre X One Biphase 16 1. 30 Tennis