Roast Beef - Where's it come from?

I've been loving roast beef lately.... roast beef + cheddar + veggie wraps are pretty much my go-to snack at the moment.

I'm just curious what 'cut' of beef most 'roast beef' slices are that you find, because the fat/protein ratio is leaner than any cut of steak I'm familiar with, but packaging always just says "beef"...

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