Schwalbe Aerothan TPU Tube 29x2.1-2.4" PV 40mm CheckoutSpec= 6803 - 17x26x5 Ea while the silica particles are

while the silica particles are 8 and the tungsten carbide in V2 ferrules 9

then it will protect your chain in all riding conditions and allow you to ride longer between applications

3mm offset for 52mm chainline

The F2 is designed with longer pressure zones to maximize top-end speed

Weight    901g/ ½ pair (size 175)

Schwalbe Aerothan TPU Tube 29x2.1-2.4" PV 40mm CheckoutSpec= 6803 - 17x26x5 Ea while the silica particles areSchwalbe Aerothan Tube 29 x 2. 1 2. 4 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