STS was created by Prince
to give players two different feels from the same racquet. When you purchase one of these frames, you'll also receive two different grommet systems. One grommet
has more conventional string holes, which result in a more traditional feel, while the soft grommet lacks string holes resulting in a different more open feel. In the second grommet system, the strings are allowed to move more freely resulting in a much wider sweetspot. The customizable port inserts can be found around the frame at the 3, 9, and 12 o’clock positions.
In addition to the STS, the Black has larger Speedport holes for a more aerodynamic frame and a faster swing speed. Used by touring pros like the Bryan Brothers, advanced players will also enjoy the incredible feel and touch due to the open string pattern and easy access to spin.