Those fancy new tires you bought aren't worth much without a great set of inner tubes to keep them inflated. Put the Continental 26" presta valve tubes in your deep profile rims to shed some grams and keep the air in your tires. Unitube system allows greater compatibility with more tires sizes Seamless construction eliminates weak points Mold-cured and vulcanized for uniform roundness and improved reliability at the valve stem insertion Every tube must pass 100% quality control inspection 42mm Presta valve.