The training tire benchmark includes a strong nylon casing, secure grip, and long tread life. Using a mixed tread design, optimized for all-around use, the Zaffiro works well in a range of training conditions. Add the durable folding nylon casing, and you get a performance oriented training tire at a great price!Top Features:60TPI Nylon CasingSpecification:Size: 700x25CWeights:275gBead: FoldingOption: 1 or 2 tires