Tough all-weather performance. The Continental Grand Prix 4 Season is a high-performance road tyre the is built to hold up under the most challenging conditions while still giving you the rapid rolling performance you need. Key Features: Rubber compound: Max Grip Silica - for optimized wet weather adhesionCasing: 330 tpiPuncture protection: Vectran Breakersynthetic liquid crystalline polymer layer, prevents objects piercing through the treadBead: foldingDesign: Handmade in GermanySizes: 700 x 23c, 700 x 25c, 700 x 28cColour: blackWeight: 240g (700 x 25c) Thanks to its DuraSkinanti-tear fabric and two Vectran anti puncture strips, the Grand Prix 4-Season holds up under extreme conditions. In the Paris- Roubaix race, the "Hell of the North", cyclists equipped with DuraSkinenhanced tyres have the fewest tyre related problems during the race. Incorporating our special wear resistant carbon compound, the tyre is characterized by very good mileage performance as well