These seem pretty good. Small ball bearings. They rotate smoothly. Seems well done. Got them for a science project. I think they will work fine. I hope they hold up to the "strain" but there's no reason to think they won't.
FKG 99502HNR Bearing Width Pre Lubricated
5 Review
π§ High-Quality TIMKEN 6203 2RSC3 6203 2RS Bearing - Size: 17X40X12mm
4 Review
π Wheels Manufacturing Ball Retainer Bag: Convenient Storage and Protection for Your Ball Retainers
6 Review
Enhanced Performance Sydien SCS12UU Bearing Bushing Diameter for Precision Machinery
4 Review