hard stuff

I think it's made of some hard stuff that may snap, but can't break.

I can stand what any other man can, and without the hard stuff, either.'

"That's the first time I ever saw you touch the hard stuff," he observed.

That's it, the old gal hasn't many failings, but one of 'em is an over-fondness for hard stuff.

And the little boy was very fond of it—it was made of hard stuff, you know, all white and shiny, and it had blue eyes.