No flats joes self sealing mtb inner tubevery high quality mountain bike inner tubes prefilled with joes super sealant the worlds leading tire sealant prevents flats by instantly sealing punctures in the tread area of the tire up to 3mm 220 gram inner tubes prefilled with 120 grams joes super sealant total 340 grams for 26 tube tipsif you get a puncture always spin the wheel to distribute the sealant if spinning does not work find the hole in turn the wheel so the hole will face the