Toroline O-TORO Tennis String (Single Pack) 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. 🔑 Key Features: 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) 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. 📐 Specifications: String Gauge (Thickness) 17 (1.23 mm) Color Neon Green, White, Neon Pink, Black Profile Hexagonal Length 1 package includes 2 half sets (6.7 m length per half set)