Challenge, CRITERIUM SC S Tires Handmade Clincher, 700c x 23C, 320TPI Sealed Corespun Cotton, 320TPI, PPS anti-puncture belt, 205g, 105-1453PSI, Black/Tan Handmade with Super Supple 320TPI Corespun Cotton Casing, "Corespun Cotton" has a polyester core wrapped in high quality cotton fiber-then sealed against elements for superlative ride and performance Natural Rubber Tread Compound provides ultimate grip, traction and ride PPS belted Puncture Protection System keeps you rolling Criterium's legendary reputation for high performance based upon countless podiums.