14 inch inner tube by Schwalbe with Schrader / car type valve.
Not all bicycle inner tubes are constructed to the same quality as the Schwalbe range. They test all tubes (twice), including inflation for 24 hours to ensure they maintain air pressure.
Less lost air means less time inflating and more time for you, whether it's riding, in bed before work or at the office.
This inner tube fits ETRTO tyre sizes as shown below: