AT ONLY 65G EACH (APPROX. 50% LIGHTER THAN A REGULAR ROAD TUBE) PANARACERS R-AIR ULTRALIGHT INNERTUBES WEIGH LESS THAN MANY LATEX TUBES. THEY ARE PRODUCED WITH A SPECIAL BUTYL COMPOUND SO UNLIKE LATEX OR OTHER MANUFACTURERS "LIGHTWEIGHT" TUBES R-AIR TUBES DO NOT LOSE AIR & DO NOT SACRIFICE PUNCTURE RESISTANCE. AVAILABLE IN 3 VALVE LENGTHS FOR SUITABILITY WITH VARIOUS TOP END WHEELSETS FOR THE WEIGHT CONSCIOUS ROADIE.