Apple Pencil - roller cap

[gtmac]

I have tried to find this answer but my google-fu isn't working.

What is the point of the roller on the cap of the pencil? Is there a functional purpose?

 

[Bbqthis]

I have tried to find this answer but my google-fu isn't working.

What is the point of the roller on the cap of the pencil? Is there a functional purpose?

Roller on the cap? What do you mean?

 

[gtmac]

Sorry not and roller, maybe a button? The circle thing at the top.

 

[Bbqthis]

Sorry not and roller, maybe a button? The circle thing at the top.

It's an air gap so that if someone chokes on the cap they can still breathe.