Inner tube pre-filled with pucture fixing gloop. Pull the thorn out and the gloop escapes.-When it contacts the air, it fills the hole. All you need to do is pump a bit more air in occasionally.-A bit of extra weight but a lot less hassle.-You get 1 tube which will Fit Mountain Bike sizes 26" x 1.75 - 2.125-Weight: 320grams.
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