R166 ZZ Bearing, ID 3/16 inch x OD 3/8 inch x 1/8 inch Miniature Ball Bearing, Metal Shielded and Pre-Lubricated with Grease, 3/16 inch Precision Roller Bearing (10 Pack): Amazon.com: Industrial & Scientific
Gcr15 Solid Balls Ø 1mm - 15mm High Precision Bearings Rolling for Linear Slider Chrome Steel Ball Beads Round Smooth - AliExpress
GRW High Precision Ball Bearings Catalogues | IEC Ltd