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Correction to the dimensions and link:
It is called 3/4″ EMT conduit but it is actually .922″ outside diameter and ~.82″ inside diameter. I used Home Depot but Lowes may be the same thing (measure it first before buying).
These are zinc coated steel and are very stiff. The bearings work a bit roughly at first, then the zinc coating rubs off under the bearing after a while making a nice smooth surface. I just ran some hand edited G code that moved the axes back and forth until the zinc wore down. Then I sanded them just a bit with very fine sandpaper to get the sharp edges off of the zinc “race”. I used a regular pipe cutter with many rotations of the cutter for a cleaner cut than with a hack saw.