Schwalbe 16" / 18" Brompton presta inner tube - SV4

This is a thinner than normal Brompton tube with a presta valve (aka french value, high pressure valve or 'that skinny valve'). 

This is not for standard brompton setups, this is the one you need when you are using racing tyres on a Brompton such as the Schwalbe Kojak or Schwalbe One (tanwall) tyres