Seamless 'one-piece' latex inner tubes provide a smooth, balanced ride with no pucker or bump like those found on other tubes. Latex tubes are lighter, thinner and more flexible than a butyl tube, increasing your comfort, lowering your rolling resistance, and helping to prevent flats. The tube also includes a removable core Presta valve making them compatible with both inline and external valve extenders. -Seamless & smooth latex material, no bumps at the valve -Improves rolling resistance and comfort -Strong and extremely elastic, thus very reliable -Is lighter weight than standard butyl and some superlight butyl tubes -Has a two-piece removable valve core for valve extender use -Handmade construction