These are the small bearings that are included with the Mini V Wheel Kits.
They can fit a variety or projects, for instance, filament extruder as they have a standard 5mm ID bore.
Part Details
Chrome Steel
Dimensions 10 OD x 5 ID (M5 Screw Size) x 4.2mm 'thick'
Version 3
ABEC 3
105zz