Schwalbe Aerothan Tube - 700 x 35 - 50 40mm Presta ValveSchwalbe Aerothan Tube 700 x 35 50 40mm Presta Valve. Developed in cooperation with BASF and with experts from the German plastic manufacturing industry the Aerothan tube emerged to not only meet all the requirements of a high end bicycle tube but to exceed them. Fully light weight right to the valve about 40% less weight than a comparable Schwalbe extra light tube Puncture protection newly defined the material itself prevents sudden air loss Minimal