The ISOSPEED Black Fire is a polyester string with excellent control and surprisingly good playing comfort. The Black Fire has already been pre-stretched for better tension stability. It also benefits from special additives and Liquid Wax technology, which are designed to reduce friction-related wear. The result is a co-polyester string that not only lasts longer, but also gives you a bigger snapback effect for more spin.
- Diameter: 1.25mm
- Length: 12m
- Material: Monofilament Co-Polyester
- Colour: Black