Kirschbaum Pro Line II 1.25 is a co-polyester tennis string designed for players seeking a balance of control, spin, and comfort. Its smooth monofilament construction provides a predictable response with a softer feel than many firm competition polyesters, making it easier to maintain control without an excessively harsh impact. The 1.25 mm diameter offers a versatile combination of responsiveness, spin potential, and durability.
Intermediate to advanced players who generate their own power and want a controlled polyester string with a more forgiving feel. Suitable for aggressive baseliners and all-court players who value consistent performance without the stiffness of firmer polyester alternatives.
| Material | Co-polyester |
| Construction | Round monofilament |
| Gauge | 17 / 1.25 mm |
| Length | 660 ft / 200 m |