Co-developed with former Top 25 ATP Pro Steve Johnson. the Toroline O-Toro Spin 17 1.23 serves a twist on a best-selling string. Its pentagonal shape delivers aggressive spin. sharp bite and a higher launch angle to clear the net. Whether you want to rip heavy shots from the baseline or need an extra kick on your second serve. the Toroline O-Toro Spin 17 1.23 supports your game!