Specialized isn't afraid to say that their GRIPTON compound is one of the best out there. When the GRIPTON compound is combined with an ultra-supple 320 TPI poly-cotton casing, you get a tire that's very special. You get the Turbo Cotton tire. Both materials stand for master craftsmanship, and they work in harmony to reflect the dedication that Specialized has to construct some of the world's fastest tires. By bringing both of these materials together, it provides a clear-cut performance advantage. Features: 320 TPI Polycotton casing Foldable bead BlackBelt flat protection Specifications: Tire Type: Clincher Bead: Folding Compound | Casing: Gripton | Polycotton TPI (Threads Per Inch): 320 TPI Puncture Protection: Yes Inflation: 85 - 125 PSI (Varies By Model) Color: Tan Wall Weight: 240g (700c | 26mm)