Micro, small and miniature bearings from 0.6mm bore up to 9mm bore
1 steel ball bearings S681 - Runstar
Small Thrust Ball Bearing 6mm ID, 12mm OD (12 pack) | Studica Canada
Amazon.com: ATOPLEE Miniature Ball Bearings 100pcs 681ZZ Tiny Metal Ball Bearings Wheel Roller for Toy Model DIY Mini Stuff (1x3x1mm) : Industrial & Scientific
High Precision Small Size Mini Miniature Ball Bearings - China Ball Bearing, Bearing | Made-in-China.com