Road bikes and some hybrids use tubes with a presta valve.
Road bike tyre valve caps.
This is a thin narrow tube that has a metal screw feature that seals the valve shut.
A lock nut to secure the stem at the wheel rim and a valve cap may also be present.
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The presta valve also called french valve fv or sclaverand valve is a valve commonly found in high pressure road style and some mountain bicycle inner tubes it comprises an outer valve stem and an inner valve body.
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Keeping the screw shut is the most important thing and the plastic caps on top does two functions.
For such a small component the bike tire valve plays a significant role in ensuring the overall success of a ride.