The Schwalbe Marathon Tires incorporate light-reflecting sidewalls for better visibility and also utilizes a Silica compound for easy rolling and longer life. FEATURES : SmartGuard puncture protection to resist thorns, shards and even thumbtacks Marathon Silica compound for easy rolling and longer life Reflex sidewalls incorporate light-reflecting bands SPECS : Labeled Size: 26 x 2 Color: Black/Reflective ISO Width (mm): 50 ISO Diameter: 559 / 26" MTN Flat Protection: Tread Weight (oz): 38.8 Tire Intended Use: Touring-Hybrid Defined Color: Black Weight: 1100 Tire Type: Clincher Tire Diameter: 26" Tire Bead: Wire