Budget Rubber Sealed Deep Groove Ball Bearings: Oneof the most commonly used bearings, these types are manufactured withrubber seals inserted into the outer raceway and in contact with theinner race providing protection against the ingress of moisture, dustand other foreign matter and serve to retain the pre-filled grease inthe bearing.
Seals can be easily removed for applications that only require 1 seal.
Benefits: Prevents moisture and dirt getting into the bearing, lubricated for life, cost effective solution