O-TORO is TOROLINE’s best-selling and most spin-friendly string—co-developed with former Top 25 ATP pro Steve Johnson to give players explosive performance without sacrificing comfort. Lab-tested by Racketpedia with a perfect 100/100 spin rating, O-TORO also ranks as more comfortable than many of the top-selling co-polys on the market. In head-to-head lab testing by Tennis Warehouse, O-TORO outperformed Babolat RPM Blast with: +104% higher spin potential –29% lower stiffness (for more comfort) What makes O-TORO special? It delivers elite-level spin while maintaining a controlled, comfortable response—ideal for big hitters looking to unlock next-level spin and put away power with confidence. Look no further for the best value co-poly string on the market! Gauge: 1.23MM/17 Colors : White Profile: Hexagonal Length - 660FT (Approximately 16 Rackets)