You're going to have to explain this to the young.
Top Cap full-colour printed onto an aluminium flat top headset Stem Cap with a high gloss UV coating.
- Supplied with a Black steel bolt.
- Standard headset top cap for 1 1/8th inch steerer.
- Top Cap is 31.8mm in diameter and fits nearly every modern bike. Mountain, Road, and Commuter.
Headset Stem Cap / Top Cap whichever you call it's the finishing piece to your bike.