■180TPI / 3 layers ■ Uses silica compound. ■ Built-in polyX breaker ■Duraskin used ■Recommended Air Pressure (PSI): 110-120 (650 / 700x23C) / 130-160(20C) / 95-120(25C) / 95-115(28C) / 85-102(32C) ■Made in Germany