Schwalbe tubes are designed & manufactured to retain air pressure considerably longer than their competitors. 

Not only is each individual tube inflated & inserted into a mould to ensure that there is even wall thickness & excellent air retention, 

they are also stored under pressure for 24hrs to test air retention. Valve length of 40mm for Standard version. Weight 95g

Applicable Tyre Sizes:

28-406 - 20 x 1.1

32-406 - 20 x 1.25

35-406 - 20 x 1.35

37-406 - 20 x 1.4 

40-406 - 20 x 1.50

Suitable for 20" bike, such like Dahon, Tern, Birdy, BMX.