Toroline O-Toro

Co-developed with former ATP Top 25 pro Steve Johnson, O-TORO is TOROLINE’s best-selling and most spin-friendly co-poly string—engineered for players who demand explosive performance without sacrificing comfort. Lab-tested by Racketpedia with a perfect 100/100 spin rating, and proven in head-to-head testing by Tennis Warehouse to deliver +104% more spin potential and 29% lower stiffness than Babolat RPM Blast, O-TORO gives you unmatched spin, control, and arm-friendly feel. Its hexagonal profile bites into the ball for elite-level RPMs, while its softer response offers superior comfort and playability, making it ideal for aggressive baseliners and heavy topspin players. Available in 1.23mm (17 gauge) O-TORO strings up to 8 rackets (330ft) and delivers pro-level performance at the best value on the market.