Material: Polyester Thickness: 1.25mm For 4 rackets Sold as a roll cut. Despite being a polyester string, it's soft. Also, the string has grooves, making it very easy to generate spin. It's very similar to Prince's Tour XX Spin. Recommended for those who like a soft feel, those who want to generate a lot of spin, women, and those who want to reduce string costs! 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.