These will fit 28"/700c wheeled bikes running tyres from 28c - 32c
Standard 40mm Presta long valve
Reinforced dual thickness tube valve interface to prevent punctures
Light weight butyl rubber construction.
 
Suitable replacement tube to fit the following tyre sizes:

700 x 28c            (28-622)
700 x 30c            (30-622)
700 x 32c            (32-622)
27 x 1 1/4"  Fifty   (28-630)
27 x 1 1/4"            (32-630)