@ekaitz_zarraga All I did was a quick ebay search but I found some 8mm: https://www.ebay.co.uk/itm/5X-Dia-8mm-Sliver-Ball-Metal-Transfer-Bearing-Unit-Conveyor-Roller-Wheels-D-E4H/233762441858?hash=item366d53ca82:g:pKEAAOSwn1FZq9BP and some 4mm: https://www.ebay.co.uk/itm/5x-Dia-4mm-Ball-Metal-Transfer-Bearing-Unit-Conveyor-Roller-Wheels-2-Hole-Set/193476673065?hash=item2d0c1bbe29:g:~TMAAOSwrfFd2-Rh
@ekaitz_zarraga Well I bought the 4mm ones... They're not 4mm. They're 15mm. The seller put the diameter of the holes in the listing title instead of the diameter of the actual ball.
So they're too big for using in a trackball and also really not smooth at all.
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