Vittoria Zaffiro II Wire Aramid 3D Compound construction gives you lightweight performance, stiffness and longevity for the road ahead Twin Tread design places hard tread in the center where the wear occurs and uses a softer compound on the shoulders for unparalleled grip when cornering Intrepid PRB material under the tread offers maximum puncture protection while maintaining low rolling resistance 26 TPI casing with high carbon content adds durable comfort Four twisted steel wires for better flexibility