6000 roller bearing. 10 mm id x 26 mm od x 8 mm wide.

Used a small amount of glue to hold components together. Alternated rollers on install.
May scale rollers for your printer to provide good operation. A little oil helps. Proper Z height will eliminate elephants foot. Extra rollers provided encase some get lost.

Prusa

i3 MK2S

No

No

1.5

100%