This size of inner tube is used on road, triathlon and some slim tyres for commuting/touring bikes.
Presta valve type (AKA High Pressure Valve or French Valve).
Removable and replaceable valve core.
42mm length valve suitable for most standard depth rims up to 30mm.
Threaded valve stem with security ring prevents rattling on the rim and makes pump attachment easier.
Reinforced dual thickness tube/valve interface to prevent punctures.
Light weight butyl rubber construction.
Weighs 75 gr