POM Plastic Deep Groove Ball Bearing Corrosion-Resistant 603 604 605 606 607-638

Rings: The inner and outer rings are made of POM, which is known for its longevity and durability. POM has a low friction factor, good wear resistance and uses high strength glass balls for smoother rotation and less noise.Has good electrical insulation properties and is virtually unaffected by temperature and humidity.

eBay