Fixes punctures before you even know you've got one! Inner tube pre-filled with puncture 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. Weight: 320g . You get 1 tube which will Fit Hybrid Bike sizes 700c x 28/32c. Presta Valve. You will receive 1 x This inner tube.