The Mitas FV47 28 x 1.1-1.75 0.90 mm tube. Mitas tubes are very high quality tubes from a Czech manufacturer. Nowadays we see the "Made in Czech Republic" sign less and less. That's why we are very happy to support a Czech manufacturer who is also at world quality. This inner tube is made of first-class butyl rubber which keeps the pressure of the inner tube for a very long time and it has excellent puncture resistance.