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 one tube which will fit 700 x 19-25.;Weight: 200grams.

• Slime 700c x19-25c Presta Valve Road Bike Inner Tube x 1

Slime 700c x19-25c Presta Valve Road Bike Inner Tube x 1Slime