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Do you mean pencil or penile, because those two things mean very different things when it comes to thickness. The stays are not pencil-thin, they are just a normal tapered stay.

These are pencil stays:

Pencil-thin.

It was an exaggeration, to illustrate the fact that I'd have though with discs you'd want some bigger tubing. But it was also a question.

WTF dude, that is grim!