Bearing that has integrated seals (usually rubber or polymer) on one or both sides, fully enclosing the inner workings. The seals make light contact with the inner ring, creating a barrier that keeps lubricant in and contaminants out.
RS - rubber seal
ZZ - metal seal
LLU - full-contact, double-lip, labyrinth (LLU) seals for maximum protection against the elements, while keeping the 90% fill of Almagard extra high pressure grease inside
