Big juicy knobs

[Radio]

Can someone tell me what the fuck 'Glass Knobs' are for? I can not imagine what purpose they serve with my tiny imagination.

http://silversurfervap.com/glass/knobs.html

So confused by these knobs.

Why the fuck is this knob $50?

 

[Vapour Clown]

It's a temperature control knob for a Silver surfer vape.

They don't serve a regular purpose that a normal metal or plastic knob couldn't accomplish, other than being fancy.