・ Babolat RPM Soft 1.25 1 string Gray ・ POWERTI 1.25 2 strings Despite being a polyester string, it's soft. Also, because the string has grooves, it's very easy to generate spin. It's very similar to Prince Tour XX Spin. Recommended for those who like a soft feel, want to generate a lot of spin, women, and those who want to keep string costs down! Monofilament Construction: This innovative synthetic polyester line uses a very soft monofilament construction, providing not only explosive power but also protecting the arm. The grooved surface provides excellent ball control and feel.